Method of using bleach in pressure washer | Expert Advise

Mold and mildew removed from your home’s siding with bleach treatments. Bleach is corrosive since it contains the chemical complex sodium hypochlorite as its active ingredient. Because pressure washers include many metal elements, including the water pump via which most people siphon bleach solution, and bleach is caustic, using a bleach solution in a pressure washer should be done with caution. Some pressure washer manufacturers advise against using bleach with their machines.

Work of Bleach in pressure washer:

When pressure washing with bleach, only use bleach mix with other cleaning solutions that are compatible with bleach. When storing liquid bleach solutions, make sure to never keep them in containers that have previously been used for other chemicals unless those containers have been fully cleaned.

Bleach in pressure washer

Uses of Bleach in power washer:

There are some instances where pressure washing with bleach is appropriate. These are some of them:

  • Mold Removal from the Roots:

If the area your power washing has been infected with mold, water alone will not be sufficient to treat it. Mold may be removed visually, but it will not be prevented from regrowing. Bleach will eradicate mold, so it’s a nice alternative to think about.

  • Treatments for Moss:

Moss can grow on the sides of buildings and walls in the same way as mold can. If there is only a thin layer of it on your surface, pressure washing it off may be effective. There’s a danger that when you wash off the power with water, you won’t remove all of the foliage off your wall, or that it will grow back. It can be avoided with the use of bleach.

  • Treatments for Biohazards:

If the area you’re washing has been exposed to pathogens or bodily fluids, you should use protective gear and a mixture of water and bleach to pressure wash it. This is the only way to clean the region in a safe manner.

  • Discoloration:

Without regular pressure washing, many surfaces become discolored, but most discoloration can be removed in a single session. However, after too many years of neglect, some surfaces may become permanently stained. If you’ve tried pressure washing a surface with little success, bleach might be worth a go.


  • Place the pressure washer where it will be most useful during the cleaning process. Place the bucket in close proximity to the pressure washer.
  • Protective glasses and gloves should be worn.
  • When the bleach solution reaches 5.25 percent to 6 percent, mix one-part bleach to four parts of water in a bucket for medium-level cleaning jobs.
  • When the bleach solution reaches 5.25 percent to 6 percent, mix one-part bleach to four parts of water in a bucket for medium-level cleaning jobs.

Check for obstructions in the syphon hose and filter, and clean them if necessary. In the bucket, place the weighted strainer on the end of the syphon tube and into the bleach solution.

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Bleach in pressure washer

Use and Disposal:

  • Connect the pressure washer to a water hose. Connect a soap tip to the wand or lance of a pressure washer gun. Attach the pressure washer hoses to the pressure washer after connecting the pressure washer gun to the hoses.
  • Turn on the pressure washer’s water supply. Pull the recoil cord or turn on the electric start to start the pressure washer.
  • To lower water pressure, drop the engine speed to near its lowest setting. Lower the water pressure by turning the pressure adjustment dial.
  • Squeeze the trigger of the pressure washer gun while aiming it at whatever you’re cleaning. The pressure washer’s water pressure will drive the bleach solution up through the syphon hose and further mix it with water before spraying it on whatever you’re cleaning.
  • If it will take more than a few seconds to replace the bleach solution, turn off the pressure washer Fill the bucket with clear water and run it through the pressure washer to rinse out the bleach in the system when you’re through.

Is regular pressure washing with bleach causes more harm than good?

It all depends on the type of surface you’re trying to clean. If you’re considering about bleaching a driveway or a stone wall, don’t worry; it won’t affect your surface. However, it could be a waste of bleach. Other materials, such as marble or wood, do not react well to bleach. Depending on how much bleach these surfaces are subjected to, their useable lifespans may be reduced. If you do decide to use bleach on certain surfaces, make a point of protecting them by applying a protective coating to them soon after you wash them.

Dilute Bleach for pressure washing:

According to some companies, bleach is a bad choice since pressure units feature seals and components that are sensitive to bleach. A pre-application of the cleanser with a garden sprayer is an alternative to using bleach in the pressure washer. This prevents bleach from entering the machine and causing harm. After rinsing the area with the bleach solution to destroy algae and mold, you can use the pressure washer to clean it. If your machine permits for bleach application, you’ll need to dilute the chemical with other products.

Method of preapplication:

  • In a container, combine 3 cups water to 1 cup bleach.
  • Pour the bleach mixture into the garden sprayer’s container. Add chemical solutions according to the sprayer’s directions.
  • Using a garden sprayer, saturate the area with bleach. After you’ve applied the bleach to the surface, rinse it off with the power washer. For application, follow the power washer’s

Pressure washer solution:

  • In a container, combine the powder laundry soap, powdered cleanser, 1 quarter bleach, and 1 gallon water.
  • With a stick, stir the fluid until all of the powder has dissolved.
  • Fill the injector container on your power washer with a tiny amount of the cleaning solution. To compensate for the water from the injection system, you may need to add extra chemicals to the solution, so start modest. Add a second round of cleaning chemicals to the original combination if the cleaner doesn’t seem to be working.


Bleach will damage the pressure washer, rendering it useless. Many companies may void a warranty if you do this to your pressure washer. Water, pure and simple, is the best cleaning agent for a pressure washer. It is safe to use on any surface and will remove most washable stains with ease. It’s vital to remember that if you decide to use bleach in your washer, you’ll need to dilute the solution.


How to use bleach in pressure washer
Mikalya Smith
Mikalya Smith

Cleaning expert and the head of content in cleanz. She has tremendous experience with cleaning methods and techniques.