How Safe is Bleach to Use On My House When Pressure Washing?

We often get asked this question when a pressure washing job comes our way from a first time customer. This question comes up so much that we decided to write out a post about it and refer people here instead of having to repeat all of this while we are standing there or on the phone. This not only frees us up to get to work cleaning or answering another call but it also helps you to see things clearer.

  1. What is bleach really?“Bleach” is a generic term classifying a group of chemicals that can turn things white or bleach out their color. The most common bleaching agent that you will find in many pressure washing operations is Sodium Hypochlorite. NaOCl (Sodium Hypochlorite) or SH is a very effective bleaching agent and disinfectant. The most common solutions are 3-8% concentration of NaOCl to water. 40% solution of NaOCl and water (H2O) is considered the threshold where it becomes a hazardous oxidizer and should be avoided. The concentrations at which your home is cleaned with bleach is much lower than the 3-8% contained in a standard bleach bottle, coming out to anywhere between 5:1 to 900:1 parts water to parts bleach.
  2. Is it the same bleach that I have under my kitchen sink? In most cases yes it is chemically similar. Often times your “household bleach” will be Sodium Hypochlorite with a little Sodium Hydroxide and the remaining 92-97% water.
  3. Do you use straight bleach on my house? No we dilute our chemicals down to the proper levels per the label on the chemical bottle. The chemical label is the law and us going with a ” more is better” approach with chemicals is both illegal and bad for our environment. Not only that but we would be wasting money on unnecessary chemical usage. 
Is It Really Worth It To Get My Roof Pressure Washed?
How To Remove Gum From Sidewalks and Driveways