Kitchen Exhaust Cleaning School

Are you wondering what to do all winter? Kitchen exhaust cleaning is a pressure washing service that is required all year long. It can be done with equipment that you may already own, and you can become certified in just 5 days. All restaurants in the United States and Canada are required by law to have their kitchen exhaust systems cleaned on a regular schedule. Grease buildup inside of a commercial kitchen exhaust system must be removed to prevent fires. Restaurant owners and managers understand that kitchen hood cleaning is government mandated and enforced by local fire inspectors as well as the insurance companies.

Kitchen Exhaust Cleaning is a little different than other types of pressure washing.

The regularity of cleaning will depend on how quickly grease builds up in the exhaust system. The type of cooking and frequency of use will impact grease buildup. Retirement centers, daycares, and other commercial kitchens that don’t have as much use will not require cleaning as often as fast food restaurants with deep fryers for example.

A typical kitchen exhaust cleaning takes about 3-4 hours. Cleaning is mostly done at night when restaurants are closed or slow. Every job begins with a complete inspection of the entire exhaust system. Photos must be taken to document the state of the hood before cleaning and note any deficiencies that could impact your ability to clean the system. After the inspection, the hood must be wrapped with plastic to protect the surrounding area from over-spray. Cleaning typically starts at the top of the system, on the roof,  where the fan is located. Then you work your way down to the bottom. After the cleaning, the hood is polished, and the final result is documented with pictures.

You may already have the equipment you need to get started.


Hot water is required when cleaning kitchen exhaust systems, but it is still possible to use a cold water washer if that washer is equipped with hot pack seals. Cold water pressure washers with hot pack seals allow you to run the hot water from the restaurant through your pump. The DELUX 4035HG-HOT-ES is a gas powered, cold water pressure washer with a belt drive system and hot packs for hot water. It is capable of generating 3,500 PSI at 4 GPM. These machines are lighter and smaller than hot water machines, but you must rely on the restaurant to provide hot water. If you want to upgrade to a hot water system, you could use the RK-47 gas powered, hot water pressure washer. The machine features a vertical burner system and a 30 inch wide base mounted on 4 semi-pneumatic tires.

Green Beast

V-502 Green Beast will enhance your cleaning capabilities when removing non-trans fat oil build-up from kitchen exhaust hoods. It is sold as a powder so it can be mixed into a solution strong enough for any job. For Asian style restaurants, you will want to use OD-100 Asian Kitchen Grease Fighter. It is specially formulated to attack grease deposits created from Asian style cooking.

A chemical resistant pump up sprayer is needed for chemical application. For this, look no further than the Chapin 2 gallon industrial cleaner degreaser pump sprayer. These professional grade pump up sprayers are built with Viton® seals and gaskets to hold caustic chemicals used for kitchen exhaust cleaning. An extra wide mouth makes pouring stress-free. A 42 inch hose and 12 inch extension wand provide 54 inches of reach into tight spaces. The wand tip twists to allow the spray pattern to adjust from a fan to a zero degree point for extra reach.

AF-20 Airless Foamer

Another option for chemical application in kitchen exhaust systems is the AF-20 Airless Foamer Nozzle. Use it with R-1400 Super Booster to quickly generate a thick foam coating of concentrated chemical that clings to any surface. It snaps to your gun or wand with a 1/4” quick connect plug. Metering tips are include to make it easy to accurately set the chemical dilution ratio. It comes with two foam nozzles ; a fan pattern for quick coverage close up and a zero degree for distance. - up to 25 feet. The AF-20 Stainless Steel Airless foamer allows chemical to be applied at higher pressure than a pump up sprayer, with a higher flow rate, and hot water.

When it comes time to rinse the long duct runs, most professionals reach for the Stinger Variable speed duct cleaner head for Driploc®. What separates the Stinger 6 inch duct cleaner from any competition is the revolutionary " Deep Cleaning Variable Speed Control Head Technology". By simply adjusting the angle of the spray arms located on top of the cleaning head you can adjust your clean R.P.M. from 0-3200 while NOT giving up any volume, pressure or temperature of your pressure washer! Slowing the nozzle down will allow the water stream to penetrate into the surface resulting in a deeper more effective clean.

Sign up for the Power Wash University Phil Ackland Kitchen Exhaust Cleaning Certification Program

Certification is required in many parts of North America, but even if your city doesn't require it, certification will put you ahead of many of your competitors. The curriculum of the Power Wash University Phil Ackland Certification Program is designed to provide a well-rounded introduction to starting a successful kitchen exhaust cleaning business.

  • You will learn to maintain your kitchen hood cleaning equipment to maximize its efficiency.

  • Learn to successfully sell and market your kitchen exhaust cleaning business.

  • Discover how to build a solid working relationship with local fire departments and other inspectors.

  • Understand what records must be kept to protect your kitchen exhaust cleaning business from potential liability.

  • Build a database manage customer relationships and increase the value of your new kitchen exhaust cleaning business.

  • Gain firsthand experience managing wastewater from kitchen exhaust cleaning to stay in compliance with the Clean Water Act & the EPA.

Starting a kitchen exhaust hood cleaning business will require a lot of planning and study. Understanding the rules for legal compliance is just the first step. Phil Ackland Kitchen Hood Cleaning School will help you take the next step to get you on the path to success.

With profit margins ranging from 40%-60%, starting a kitchen exhaust hood cleaning business can be an extremely lucrative endeavor. The Power Wash University Phil Ackland Certification program will provide on the job experience cleaning, inspecting, and bidding kitchen exhaust systems. You will use the latest and most effective equipment, tools and accessories available. Classes are held monthly all year long. Don’t sit around all winter. Call today!

What is your favorite trigger gun?

Your pressure washer gun may seem like a basic piece of equipment, but there is more to spray guns than you may think. Flow rate, temperature rating and pressure rating are just the start. You may also want to consider ergonomics, chemical resistance, and gun type.


The most common type of pressure washer gun in the rear entry gun. Water enters the gun from a 3/8 inch port just below the butt of the gun. Then it flows through a tube to a valve at the top of the gun. Inside that valve, a spring holds a ball firmly over the exit tube. O-rings help the ball form a tight seal. When you squeeze the trigger, a pin dislodges the ball and allows water to flow through the gun to the exit.

The components of a pressure washing gun will wear with use. They can be easily replaced, but most people prefer to just buy a new gun. Running cool water through your pressure washer at the end of the day is a great way to clean out your system and increase its longevity.

Pressure, flow and temperature rating should all be considered when you are shopping for a pressure washer gun. A good rule of thumb is to give yourself about 10% headroom. That is to say if your machine is capable of generating 5,000 PSI, you will want to get a pressure washer gun that is rated for 5,500 PSI. The same rule applies for flow and temperature. This will help your pressure washer gun last a bit longer.

legacybestgun.JPGA pressure washer gun can be compared to a good pair of boots. Some will fit better than others. The angle of the gun will vary depending on which model you choose. The angle of the trigger in its resting position will also vary. The distance between the trigger and the trigger guard must also be considered. They are definitely not a one size fits all. The shape of your hand, the angle of your wrist, and even the strength of your grip should be considered. Some pressure washer guns such as the Legacy Best or the YG-5000 have a relaxed pull trigger feature that makes it easier to hold the trigger open for extended periods. Personal comfort is an important factor when choosing a pressure washer gun. Fatigue will lead to inefficiency.

MaverickGun.jpgIf you are soft washing with sodium hypochlorite or any other type of harsh alkaline you may want to consider using the JA-8000 PVC trigger gun. It has a lock to hold it open when it is in use and a nice angle for high and low places. The JA-8000 is not technically a pressure washer gun with only 700 PSI tolerance but it is a nice step up from a plain old PVC ball valve.

For high pressure chemical resistance, you may want to consider the Comet MV2002 pressure washer gun with stainless steel internal components. This type of gun is a great choice for situations when you downstream strong acids or bases. Stainless steel is a much stronger metal than brass. If you use corrosive chemicals frequently, it is a great upgrade.

Weep guns allow a small amount of water to flow even after the trigger is released. The small drip helps prevent freezing when pressure hose runs across frozen ground. The drawback is that they can cause the unloader valve and burner to cycle on and off. This will reduce he lifespan of these parts. Weep guns are not recommended for everyday use.

A dump gun is similar to a weep gun, but it has a second tube that allows the water to continue flowing even when the trigger is released. Unlike a weep gun, the dump gun redirects 100% of the water to a low pressure nozzle. This eliminates the problem of your pressure washer pump overheating in bypass mode. It also means that the burner can stay on when the trigger is released. The water stays hot, and reduces the risk of freezing. The disadvantage of dump guns is that you must shut off your machine to stop the flow of water.

StraightTrigger.jpgLinear guns, or straight guns do not have an angle. This makes them more comfortable to hold when using a surface cleaner or in applications where you are washing above your head.

There are two more types of guns that are not very common in professional pressure washing. The front entry trigger gun has an inlet in front of the trigger. The advantage of this type of gun is that they don’t allow hot water to pass through the pistol grip. Another type of gun is the open gun. This type of gun does not have a trigger. The advantage of the open gun is that they do not require an unloader. The disadvantage is that you must completely shut off your pressure washer to stop the flow of water. The other disadvantage of both guns is that they are not as durable as most traditional pistol grip trigger guns.

A pressure washer gun is a special type of valve that stops, or redirects the flow of water from your pressure washer. Take time to find one that fits your hand and your budget. Consider chemical resistant options if you work with strong acids or bases. Pressure washers in cold climates may want to consider dump guns or weep guns. Always make sure that your gun is rated for the machine that you will be using, and never try to disable the automatic shutoff safety feature. 

Burner Nozzle


Have you set all of your clocks back yet? Have you changed your burner nozzle? The time change is a great time to schedule seasonal maintenance. It makes it easier to remember to do it, and it is usually right around the time when the weather shifts. The article below was published on our blog back in 2014. It has some great tips for maintaining your pressure washer burner. 

The heater portion of a hot water pressure washer requires more maintenance than any other part of the machine. Pressure washer burner maintenance extends past the components that make up your burner assembly. In order for your burner to operate at peak efficiency, your engine, battery, pump, and unloader must be functioning properly.


A water separating fuel filter should be installed in your burner fuel line. (RACOR or equivalent) The filter should be checked daily and drained, if any water is found in the bowl. The burner fuel tank should be topped off at the end of each work day. (If there is no dead air space in the fuel tank condensation can’t form in the fuel line!) The fuel filter element should be changed every two months regardless of the amount of use or the quality of fuel used. If the fuel becomes contaminated the filter element should be changed prior to using the heater and the fuel should be replaced with fresh clean fuel.


The fuel nozzle should be changed as the seasons change. The burner is set up to raise the temperature of the inlet water to around 110 degrees above the ambient range. In the summer you will need to install a fuel nozzle that has an orifice that is smaller by ¼ of a numbered size. Example: Winter Nozzle Size 2.00 80 degree B. The Summer Nozzle Size should be 1.75 80 degree B. Doing this will assure that your water stays in the same temperature range as the seasons change. Also fuel nozzles wear with use and you will get an uneven fuel pattern which will cause poor ignition and smoking.

Burner electrodes should be changed when you change the fuel nozzles, because they will also wear with use and this wear will create ignition problems. Electrodes must be set properly when they are changed. This setting will vary with the type of heater that you are using. I recommend that you check with a certified repair shop to determine the proper setting for your electrodes.

Burner drive couplings should be replaced yearly because they are made of plastic and will also wear as time passes. Burner tune up kits are offered for different types of burners. These kits contain electrodes and drive couplings as well as other things that you may need. Your vendor of choice should know what you need based on the type of pressure washer that you are using.


There are other parts of the Heater that may fail due to use or due to the improper operation of certain other components of your pressure washing system. If the charging system in your engine fails, the battery which provides the electricity for a 12 volt burner will not maintain enough power to operate the burner. Low power to the burner can cause electrical components to fail as a result of this, or they may just cease to operate. For this reason you should test your charging system occasionally. Your engine is designed to charge at a certain rate based on the speed of your engine. If your engine should slow down for any reason this will also cause a loss of charging power thus creating a low voltage issue. If you are using a 120 volt burner system your engine will be driving a belt driven generator which must run at 3600 rpms to maintain the proper voltage output and the proper Hz or voltage frequency. This is set up at the factory by installing the proper drive and driven pulleys and assuring proper belt tension. This speed will be maintained so long as the engine speed remains the same and the belt tension is correct. You must also occasionally check this belt for wear and replace it as needed.


Pressure washer manufacturers use either an adjustable thermostat or high limit switch to keep the heater from overheating. Either is subject to failure due to excessive pressure spikes in the system, power surges or improper handling of the machine. If either of these units should fail they most commonly fail in the open position which means that your burner won’t work at all. In order to test this condition, you must temporarily bypass the component to verify that it is responsible for causing the problem. If you determine that this is the problem you then must replace it before using the heater. DO NOT OPERATE THE HEATER WITH ANY SAFETY DEVICE BYPASSED!


When you release the trigger at the gun, and interrupt the flow of water through the heater, the fire that heats the water must also be stopped. If the burner continues to burn, you will cause a steam explosion. It is for this reason, manufacturers use a pressure switch or high pressure flow switch. Either is subject to failure due to wear, extreme pressure spikes, power surges or abuse. If either of these units should fail they most commonly fail in the open position which means that your burner won’t work at all. In order to test this condition, you must temporarily bypass the component to verify that it is responsible for causing the problem. If you determine that this is the problem you then must replace it before using the heater. DO NOT OPERATE THE HEATER WITH ANY SAFETY DEVICE BYPASSED!

Regular pressure washer burner maintenance will help you avoid costly repairs. If you have any questions about pressure washer burner maintenance, call our experts at 1-800-433-2113. We can help you get the parts you need to keep your machine running at peak efficiency.

This advice is intended for use with oil fired heaters as they pertain to pressure washers only. This is in no way intended for use with any other type of heater.

Start Soft Washing

Delux® has a complete line of soft wash products to help you start soft washing. Soft washing has a high potential for profit with a relatively low entry cost. It can be a great way to start a business or an add on for an existing pressure washing business.

What is Soft Washing?

Soft washing is a cleaning process that uses chemical resistant pumps to apply sodium hypochlorite at low pressure to clean organic stains. Soft washing is the best method for removing moss, lichen, algae, mold, and mildew for soft surfaces such as rooftops, siding, stucco, and dryvit. Pressure washers can damage soft surfaces and void their warranties.

What will you need to start soft washing?

The first thing you will need to start soft washing is a soft wash system. At its most rudimentary level, a soft wash system consists of a tank for holding chemical, a pump and hoses for moving chemical, a trigger gun for controlling flow, and a nozzle to guide the spray. Delux makes several great pre-built systems such as the Bronco, the Maverick or the Stallion, but a kit can be a great cost efficient way to get started soft washing.

What comes with a Delux® Soft Wash Kit?

  • Four PVC hose barbs

  • Three hose clamps

  • One JA-8000 trigger gun

  • One 24 inch PVC Wand

  • Steel quick couplers

  • Four nozzles

  • 162 feet of PVC hose

  • One mesh screen filter

  • Thread seal tape

  • One 12v pump.

You will also need a 12v deep cycle marine grade battery to power the system, and a tank to hold your sodium hypochlorite solution.

You can enhance your soft wash system with some additional items that can make it easier to get started soft washing.

  • J-Rod nozzle holder is a device that holds four of your most used nozzles for convenient switching.

  • An Accumulator tank allows you to maintain pressure in your system without placing demand on your diaphragm pump. This reduces the number of times that the pump must cycle, and creates a smooth quiet flow. The pump stays cooler and uses less power from the battery. The leads to longer work periods and increases the lifespan of the pump.

  • Titan Stainless Steel Hose reel with PVC drum. The Titan 5418 hose reel is constructed from type 304 stainless steel for maximum durability. It is designed to stand up to corrosive chemicals used for soft washing like sodium hypochlorite. Hook up the Titan T5418 to a soft wash kit with 2 PVC hose barbs (BHB-1212), and some chemical resistant hose.

  • A battery box. Keep your battery dry and protected.

Before you start soft washing, you’ll need to acquire some chemical. You can find Sodium hypochlorite (12%) at most pool supply shops, but it is not all you will need. While sodium hypochlorite is the primary ingredient is most soft wash mixes, it can be made much better with additional ingredients. Fresh Wash offers four ways to help increase your cleaning power. First, it breaks the surface tension on the cleaning surface. It also increases the hang time on horizontal surfaces. This allows the sodium hypochlorite to penetrate deeper into stains. This increased dwell and penetration allows for bleaching reaction to happen at a lower overall bleach concentration. It also includes rinsing agents that help fight hard water spotting, and features a masking / cover scent. For even more cling and penetration, Delux® offers EZ-Cling Super Concentrated Roof Cleaner additive. You can use both products in conjunction without diluting a sodium hypochlorite solution.

Maverick™ Soft Wash SystemMaverick™ Soft Wash System

If you prefer to start soft washing with a prebuilt system, Delux offers several solutions. The Maverick Soft Wash System is professional grade soft wash machine for low pressure roof cleaning, and house washing. It features a high strength aluminum tube frame that protects a Delux D7150 12v diaphragm pump, a Flojet Accumulator, and a water tight battery box. A Titan hose reel sits on top of the frame with 200 feet of chemical resistant hose. The Maverick Soft Wash System is strong, efficient, and ready for work.

The Bonco™ Soft Wash SystemThe Bonco™ Soft Wash System

The Bronco is a mobile version of the Maverick. It includes the same 12 volt, 7 GPM, 100 PSI, Delux diaphragm pump, and a Flojet accumulator tank, with a battery box mounted on an aluminum cart. Weighing just 95 pounds (43 Kg), it is ultra-light with a powerful 30 foot reach. If you are looking for a machine to add to your rig for certain jobs, the Bronco is a great way to start soft washing.

To learn more try our online Roof Washing course

Read this before you buy your next pressure washer.

A pressure washer is a major investment; it is the backbone of your operation. Certain specifications make some machines better suited for various jobs, but that’s not what this article is about. This article is a list of the features that make your pressure washer easier to use, more durable, and easier to maintain. Some people call them the “bells and whistles”.

A clutch drive pump will save you money.clutch_pump_protection.jpg

When the trigger on a typical power washer is released the unloader goes into bypass and the pressure pump can overheat in as little as two minutes. The unique clutch operated system by disengages the pump when the trigger is released.  This eliminates pump overheating due to extended unloader by-pass, thus reducing wear and increasing the life of the pump. 

  • Prevent packing and valves from melting leading to loss in pressure and/or pulsating pressure.

  • Eliminate thermal shock which happens when over heated water during extended unloader bypass is followed by cool water when the trigger is pulled.  The sudden change in temperature is likely to cause the ceramic plungers to crack or shatter. 

  • Reduce costly down time due to repairs and maintenance of the pump.

  • Forgetting to cycle the gun cool to the pump is no longer a concern.  With the unloader in bypass the engine can run until it is out of gasoline without damaging the pump.

An electric start engine will reduce fatigue

Starting an electric start engine is like turning on a car. Simply turn the key, and it cranks right up. No more pulling a rope. Pull start can still be used as a backup.

Upstream chemical injection will make your work easier.UpstreamInjectorHighGPM.jpg

Upstream soap injection is achieved by introducing soap to water flow before the pump. This makes it possible to apply soap at high pressure. If you plan to use a soap with a neutral pH, this method can really speed up your cleaning. This feature comes standard on the RK-42, and RK-43 series Delux Hot Water Pressure Washers.

Enhanced Burner Protection™ will save you timeBurnerDiagnostic.png

The Burner Control Center from removes the guess work from diagnosing equipment failures.  An operator can know in an instant if the power and key sensory switches in burner system are functioning.  When the trigger is open all the lights should be on, if the burner is working properly.  If one or more lights go out, the operator will instantly know what is causing the problem.  The ability to quickly repair and return the power washer to service saves time and money!

  • Lighted Burner Switch – Monitors power to the burner

  • Flow light - Monitors the flow of water through the coils (the pressure switch)

  • Temp light – Monitors the system temperature (the high limit switch)

  • Fuel light – Monitors the fuel going to the burner system (the fuel solenoid)

A can style water filter strainer will help your equipment last longerfilterstrainer.JPG

Stop debris and dirt before it enters your machine and increase the life-span of your equipment. Any particulate larger than the filters element pore rating is left trapped inside the filter can. When the can is full, simply unscrew it and rinse it out.

A fuel water separator will make your burner more efficient.

The Racor R12T diesel fuel filter provides 10 micron filtration for diesel fuels used with pressure washer burner systems. Debris that could clog your fuel nozzle and cause irregular spray patterns is caught in the filter. Water in your fuel that could cause your decrease efficiency is collected at the bottom of the glass bowl.

An hour meter makes will let you know when it is time for maintenance

Every machine will come with an owner’s manual that will contain a maintenance schedule. Regular maintenance will drastically increase the lifespan of your equipment. The hour meter is like the odometer in your car. It will tell you when maintenance is needed.

A pump mounted pressure gauge will help you determine when maintenance is necessary.3000psipressuregauge.JPG

Pressure loss can be caused by many things. It could be something as simple as a worn out nozzle, or a leak in your line. But, it could be something less obvious like worn out packing, or an improperly adjusted unloader valve. The pressure gauge will give you an accurate way to measure and track these issues.

Delux® pressure washers come with the accessories you need to get started.

All Delux® pressure washers come with a 36 inch insulated wand, a trigger gun, quick couplers, 50 feet of hose, and 4 color coded quick coupled nozzles.

At we take care of our customers before, during, and after a sale! We can help you find the best machine for your needs and make recommendations for helpful upgrades that you may not have considered. Give us a call before you buy your next machine.

Get Rid of Fertilizer Stains on Concrete with Rust Remover Plus™

It usually happens when a homeowner forgets to sweep the driveway after they fertilized the lawn. They call in a panic because their driveways is covered in brown spots. Now you must figure out a way to get rid of fertilizer stains on concrete. Fertilizer stains on concrete are caused by rust. Strong acid blends like Rust Remover Plus™ are needed.

Rust Remover Plus™ is a concentrated blend of acids that effectively remove rust stains from concrete. This means that it can be applied at full strength, or diluted with water up to a 1:5 mixture. The exact dilution ratio for Remover Plus™ will depend on the severity of the rust stain and the condition of the driveway or sidewalk.

Fertilizer stains may only cover a portion of the concrete, but you should be prepared to apply Rust Remover Plus™ to the entire area. Even coverage to the entire area will prevent undesirable “clean white spots” from appearing on the cleaned concrete.

How to get rid of fertilizer stains with Rust Remover Plus™

  1. Sweep away any dirt, grass or other large particles on the concrete that is to be cleaned.

  2. Using a pump-up garden or chemical sprayer, apply Rust Remover Plus™ evenly over the entire affected concrete area.

  3. To ensure uniform coverage, apply Rust Remover Plus™ with overlapping passes using the sprayer’s cone or fan tip.

  4. Apply enough Rust Remover Plus™ to thoroughly wet area being cleaned

 How to evaluate results of Rust Remover Plus™

  1. After thoroughly wetting the area containing the rust stains with Rust Remover Plus™, allow it to dwell on the rust stain for at least 5 to 10 minutes -this will allow it time to soak into the both the rust stain and the driveway or sidewalk surface.

  2. Depending on the condition of the concrete, it may be advisable to use a stiff bristle brush to gently spread the still wet Rust Remover Plus™ evenly over the surface.

  3. It is important to allow the driveway or sidewalk surface to dry before evaluating results because as Rust Remover Plus™ dries it also brightens the concrete.

  4. It may be necessary to occasionally have to reapply Rust Remover Plus™.

  5. Once the rust stains have disappeared from the concrete, pressure wash the driveway or sidewalk using a 3,000 psi unit with a 40 degree tip.

  6. Keep the pressure washer spray tip approximately 6 inches from the surface when washing.

  7. Use overlapping passes with the pressure washer.

Understanding pH Levels in Common Cleaners

Most of the time, pressure and heat alone are not enough to remove tough stains. Chemicals are used in the pressure washing industry to speed up the cleaning process. There is no such thing as a magic elixir that will clean any stain. Knowing which class of chemical to use in a particular cleaning situation and the strength of the chemical will allow you to achieve more predictable results. What exactly makes a chemical strong? How can you be sure that a chemical is strong enough to remove a stain without damaging the underlying surface? A basic understanding of the pH levels of the chemicals you are mixing is needed to determine the strength of a solution.

Read more

What is the Best House Wash Mix for Soft Washing?

When you are looking for the "best house wash mix" you are really seeking the best concentration of bleach to use on a particular job. Additives and water will certainly help, but bleach is the primary agent. Let’s look at a practical way to determine the best house wash mix for a particular job.

You may be looking for a single silver-bullet ratio as the answer, but this is not realistic. There is no best house wash mix that is appropriate all the time. Why not? Because the variables that go into what I call the “Cleaning Equation” won’t permit it.

Elements that go into the cleaning equation for any particular job include such things as air temperature, surface temperature, water temperature, solar radiation level, age of the bleach, concentration of the bleach solution, density of the biologicals we are trying to remove, dirt contamination, and water hardness. Professional wash contractors that have been around the block a time or two know that each of these “invisible” elements have an enormous effect on the cleaning equation.

When it comes to using bleach in the building/house wash process - the most practical way to determine if you’re using the most appropriate concentration is to apply the 5-7 minute dwell time rule.  Regardless of whether you’re using a soft wash or a power wash application system, the 5-7 minutes dwell time rule still applies.

Once you apply the bleach solution to the structure’s surface, if the mold and mildew is gone after 5-7 minutes of dwell time, then the dilution is appropriate. If the mold and mildew disappear immediately, then the bleach solution is too strong. If the mold and mildew are not gone after seven minutes of dwell time, then the bleach solution is too weak.

Once you have determined the bleach concentration, you should add 1-5 ounces of Fresh Wash. When added to a sodium hypochlorite based cleaning solution Fresh Wash augments cleaning results by:

  • Allowing surface tension to be broken on the cleaning surface
  • Allowing deeper penetration of sodium hypochlorite based cleaning products into stains
  • Allowing bleaching reaction to happen at a lower overall bleach concentration
  • Allowing cleaning products to dwell (hang) longer on horizontal surfaces

It also includes rinsing agents that help fight hard water spotting, and features a masking / cover scent.

House Wash Mix*

5 Gallon Downstreaming Mix

  Water 12.5% SH Fresh Wash
Light 3 gal 2 gal 5 oz
Medium 2 - 2.5 gal 2.5 - 3 gal 5 oz
Strong 1.5 - 0 gal 3.5 - 5 gal 6 oz

X-Jet, M-Jet

  Water 12.5% SH Fresh Wash
Light 4 gal 1 gal 5 oz
Medium 3.5 gal 1.5 gal 5oz
Strong 2 - 3 gal 2 - 3 gal 6oz

50 Gallon Batch Mix

  Water 12.5% SH Fresh Wash
Light 46 gal 4 gal 6 oz
Medium 45 gal 5 gal 8 oz
Strong 44 gal 6 gal 10 oz

*Rusults may differ due to varriations in equipment used.

Roof Cleaning Mix

30 Gallon Mix

  Water 12.5% SH Fresh Wash
Light 23 gal 7 gal 18 oz
Medium 21 gal 9 gal 21 oz
Strong 19 gal 11 gal 24 oz

40 Gallon Mix

  Water 12.5% SH Fresh Wash
Light 30 gal 10 gal 24 oz
Medium 28 gal 12 gal 28 oz
Strong 26 gal 14 gal 32 oz

50 Gallons

  Water 12.5% SH Fresh Wash
Light 38 gal 12 gal 30 oz
Medium 35 gal 15 gal 35 oz
Strong 32 gal 18 gal 40 oz

60 Gallons

  Water 12.5% SH Fresh Wash
Light 46 gal 14 gal 36 oz
Medium 42 gal 18 gal 42oz
Strong 38 gal 22 gal 48 oz

70 Gallons

  Water 12.5% SH Fresh Wash
Light 53 gal 17 gal 42 oz
Medium 49 gal 21 gal 49 oz
Strong 45 gal 25 gal 56 oz

80 Gallons

  Water 12.5% SH Fresh Wash
Light 60 gal 20 gal 48 oz
Medium 56 gal 24 gal 56 oz
Strong 51 gal 29 gal 64oz

90 Gallons

  Water 12.5% SH Fresh Wash
Light 68 gal 22 gal 54 oz
Medium 63 gal 27 gal 63 oz
Strong 58 gal 32 gal 72 oz

100 Gallons

  Water 12.5% SH Fresh Wash
Light 76 gal 24 gal 60 oz
Medium 70 gal 30 gal 70 oz
Strong 64 gal 36 gal 80 oz

If you are washing vertical surfaces, you should add 1/2 to 2 ounce of EZ Cling. EZ Cling is formulated to maximize detergent adhesion and increase dwell time. It also slows drying. EZ Cling is non-hazardous, sodium hypochlorite stable, and will not dilute your mix.

Understanding the elements that go into the cleaning equation provide the professional wash contactor with an enormous advantage over his or her competitors because it provides practical guidelines for determining the most appropriate bleach concentration to work safely, effectively and efficiently.

To learn more try our online Roof Washing course



The Delux 2AHD Commercial Pressure Washer Trailer Package is built for people who depend on their equipment everyday. This 16 foot commercial pressure washer trailer is mounted on two 6,000 pound axles. Two gas powered hot water commercial pressure washers are mounted back to back for easy access from both sides of the trailer. It has enough room to support a large 525 gallon water tank, 35 gallon chemical tank, dual hose reels, and a toolbox (all included).
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