Best Power Washer Soap for All Occasions

power washer soaps compared
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power washer soaps compared

Pressure washers are powerful tools for cleaning, but sometimes they need some help in loosening dirt and grime.  That’s when pressure washer soap comes into the picture.

The mixture of water and soap cleanses faster and better than using only water in the pressure washer. You use soap to wash dishes and to wash clothes, but the soap isn’t the same. Washing clothes require a different kind of detergent than washing dishes.  It works the same with the chemicals used in pressure washer detergents to clean cars, driveways, home sidings, pool decks, and outdoor furniture.

Lets look at the best power washing soap for all occasions.

Best Pressure Washer Soap For Cars, Trucks, and Boats

When washing a vehicle, be mindful that you don’t park on a gravel driveway when using a pressure washer.  You can click here for our guide to buying a great power washer.  While unlikely, it’s possible that the pebbles and rocks of your driveway could become airbourne weapons when hit with a high-PSI water stream.  No one wants dents and dings from washing their car.  Another tip – avoid parking close to objects you don’t want to get wet.

Chemical Guys CWS_101 Maxi-Suds II Foaming Car Wash Soap (Works with Foam Cannons, Foam Guns or Bucket Washes), 1 Gallon, Cherry Scent
  • Extreme suds all purpose super foaming shampoo
  • Removes grime and dirt safely without stripping wax or sealants
  • Very easy to use in and out of the sun
  • Formulated with water softeners to reduce streaking and not leave water spots upon rinsing

Prices and availability are accurate as of 2022-01-24 at 23:15 CST - Details

Chemical Guys CWS-101 Maxi Suds II is an all-purpose washer detergent that removes dirt without stripping wax and sealants. The formula contains water softener to reduce streaking and water spots. Two to three ounces of the concentrated detergent in a gallon of water is sufficient for a foamy wash that has a pleasant cherry smell.

STAR BRITE EZ-ON EZ-OFF Hull & Bottom Cleaner
Green-friendly formula means you can clean and not harm the environment.

Spray on, wash off for easy application on tough rust and scum spots.

Star Brite Ez-On Ez-Off is a more environmentally friendly formula than the average acid-based solvent that removes deposits on boat bottom scum line, and rust stains.  The unique patented buffering process makes it a safer product than most acid-based boat bottom cleaners. It’s still an acid, so take normal safety precautions when using.

Best For Cleaning Concrete Driveways and Walks

Using the combination of power-washer detergent and water should clean most of the grime, mildew, stains, and skid marks from the driveway and sidewalks. Concrete isn’t solid, so be mindful of using the right pressure washing techniques, so you don’t damage it.

Karcher Multi-Purpose Cleaning Detergent Soap Cleaner for Pressure Power Washer, 1-Quart
  • The Karcher Promise: Cleaner. Quicker. Best-in-class cleaning performance.
  • Karcher detergents are specially formulated to work in tandem with your pressure washer to help you clean more quickly and thoroughly
  • Highly concentrated, makes up to 5 gallons of ready to use detergent from one quart of concentrate
  • Perfect for cleaning outdoor surfaces such as decks, driveways, sidewalks, stone, brick and more

Prices and availability are accurate as of 2022-01-24 at 23:15 CST - Details

Karcher Multi-Purpose Cleaning Detergent is ideal for cleaning multiple surfaces like driveways, stones, bricks, and sidewalks. The built-in cup makes it easy to measure – you’ll have no problem getting the water to soap ratio to 20:1. As a bonus, this product works great in foam cannons as well!

Zep All-In-1 Pressure Wash Cleaner 160 ounce ZUPPWC160 (Pack of 2) Concentrated Pro Formula
  • POWERFUL PRESSURE WASH FORMULA: Removes stains caused by algae, mold and mildew
  • FOR USE ON: Ideal for cleaning siding, driveways, brick, wood, stucco and other surfaces
  • CONCENTRATED FORMULA: Makes up to 26 gallons of cleaner
  • FOR USE WITH: a pressure washer or manual applications

Prices and availability are accurate as of 2022-01-24 at 23:15 CST - Details

The Zep-All-In-1 Premium cleans concrete, metal, stone, tiles, stucco, vinyl, brick, and fiberglass. It doesn’t clean glass well and is not recommended to use on deteriorated surfaces like old wood and paint. The washing concentrate removes algae stains, mold, and mildew from driveways and walkways.

Great For Clening Dirty Wood Decks and Fences

When tackling a dirty wood fence or deck, it’s better if you do a first pass with the washer to remove any loose surface grime and dust.  This will allow the pressure washer detergent to work on the deeper dirt and mildew that have built up on the surface.  Make sure you use the right color tip so you don’t damage the wood surface when removing the soap.

Simple Green Oxy Solve Deck and Fence Pressure Washer Cleaner, Colorless to Pale Straw, Unscented, 128 Fl Oz
  • Cleans decks, Fences and other outdoor structures such as pergolas, gazebos and carports
  • Lifts away tough grime, oils and grease and eliminates stains
  • Uses the power of peroxide to lift grime without harsh chemicals
  • Lifts off tough tree sap, grease and oils from decks and Fences

Prices and availability are accurate as of 2022-01-24 at 23:15 CST - Details

Simple Green Oxy solve is a biodegradable product that meets the criteria of the EPA’s Safer Choice Program. To clean grease, mold, and sap from trees Simple Green relies mainly on the cleaning function of natural peroxide. This pressure washer soap is great – when used on vinyl and PVC it removes the discoloring caused by mildew and mold.

Krud Kutter DF01 Blue Pressure Washer Concentrate Deck and Fence Cleaner with Sweet Odor, 1 Gallon, 9
  • Contains "Sporex" a unique additive which removes tough stains from mildew, mold, algae, fungus and moss and restores the original look to wood decks and fences
  • Dissolves the toughest stains from dirt, oil, grease, bird droppings, tree sap and acid rain
  • Great for use on composite decks
  • water-based, biodegradable, non-flammable, non-toxic and non-abrasive

Prices and availability are accurate as of 2022-01-24 at 23:15 CST - Details

Krud Kutter Deck and Fence is a water-based biodegradable concentrate. It contains ‘Sporex’ that removes stains from moss, mildew, algae, and fungus. Particular surfactants dissolve tough stains from bird droppings, tree sap, oil, and grease.

Top Picks For Washing Home Siding

Pressure washing soap can clean house sidings and remove mold from sidings on the shady side of the house. The power of the pressure washer may influence to what extent spiderwebs and other dirt is removed.

Briggs & Stratton 6826 Multi-Purpose Cleaner and Concentrate for Pressure Washers, 1-Gallon , blue
  • Restore and wash your siding, patio and more
  • A versatile cleaner for getting rid of dirt, grime and mold stains
  • 1-Gallon mixes with water for up to 16 gallons of pressure washer soap
  • Compatible with direct from concentrate soap system, no mixing required

Brigs & Stratton Multi-purpose concentrate removes dirt, grime, and mold from house sidings, patios, and around pool areas. Although the product is biodegradable, the manufacturer recommends safety precautions like with any concentrate.

Mold Armor FG503 E-Z House Wash, 1-Gallon
  • Powerful formula cleans exterior mildew, mold and algae stains with no scrubbing
  • Ideal for vinyl, aluminum and wood siding, brick stucco, concrete, trim and painted decks, fences and more
  • For heavy stains and soil as well as typical stains and dirt
  • Apply with a garden sprayer, tank sprayer, roller or sponge

Ideal to use for vinyl, aluminum, and wood sidings. Mold Armor FG503 cleans exterior mold, mildew, and algae stains without scrubbing. For typical stains dilute 3 to 1. Apply with a gardens sprayer or sponge and use the pressure washer to rinse off any chemicals.

Best Homemade Pressure Washing Soap Recipe For Everyday Use

Vinegar and Baking Soda Recipe for Moldy, Mildewy Surfaces

White vinegar is a common household item that won’t harm pets or plants but does kill mildew and mold . Its acidic properties remove water stains, lime deposits and dissolve soap scum. For the 9% of mold, vinegar doesn’t kill, baking soda will.

Mix half a cup of white vinegar with a quarter cup baking soda to a gallon of water.

Bleach works like vinegar but is harmful to plants, animals, and the environment.

Multi-Purpose Washing Soap Recipe

Prewash the surface with hot water to loosen tough stains and dirt.

For an eco-friendly pressure washing soap mix this recipe:

Mix 1/3 cup of phosphate-free laundry soap with 2/3 cup of powdered household cleanser to a gallon of H20. Mix well by stirring slowly.

Add white vinegar to make it a multipurpose solution that cleanses and kills most mold spores and mildew.

Homemade Recipe for Pressure Washing Wooden Decks

Mix 1 cup white vinegar to a gallon of water. The pressure washer dilutes the mixture, therefore increase the concentration if necessary.


Is soap different than detergent? When Is one better than the other?

Soap contains natural ingredients whereas detergents are chemicals synthetically produced.

Detergents can be used with any water, but soap forms scum if mixed with hard water.

Detergents are best used for disinfection and purification like cleaning mold and mildew. Soaps are great for grease and oily dirt.

Any difference between professional and consumer grade soaps?

The main difference is concentration. Consumer grade soaps are usually pre-mixed, ready for use. Some, however, need water added to the solvent before use.

Professional grade soaps come in concentrated bulk and need to be mixed with water before usage. The amount of water required is much more than the water required by the consumer soap mixture.

What are the main chemical ingredients and what do they do?

  • Ammonia cleans stainless steel and glass.
  • Bleach aggressively disinfects and sanitizes.
  • Citric Acid removes stains and cleans wood surfaces.
  • Oxalic Acid removes rust.
  • Potassium Hydroxide makes soap soft or creates liquid soap.
  • Sodium Hypochlorite removes stains and disinfects.
  • Sodium Hydroxide or caustic soda dissolves fat, oils, and grease on glass and steel.
  • Vinegar polishes bronze and brass and cleans countertops and windows.

Is Bio-degradable soap essential? When do you have to use one?

Bio-degradable soap won’t harm plants or pets. Water waste management, however, is as important. If water waste isn’t managed, even if the soap isn’t harmful, the debris, grease, mold, mildew, and stains are washed away with the soap into the storm drains.

Phosphates stimulate algae growth. Excess algae growth deprives the ecosystem of oxygen. If cleaning close to lakes and rivers, make sure the pressure washing soap doesn’t contain phosphate.

How does soap/detergent work

The best combination to clean something is hot water and soap or detergent. It’s proven with washing dishes or clothes  that hot water disperses grime and dirt easier than cold water.

Soap molecules bind to the water molecules and forms clusters that trap the dirt and grease inside. The water washes the soap with the grime away.

Can I use household bleach in the pressure washer?

Household bleach may damage and destroy the seals and rings in the pump and hose of the pressure washer. It’s also dangerous to inhale, for pets and plants. If you must use bleach, cover plants before brushing it onto a controlled surface, make sure the water containing the bleach isn’t washed away to ponds, lakes, gardens or stormwater drains.

Prices and availability are accurate as of 2022-01-24 at 23:15 CST - Details

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