The problem with this is right there in my first sentence. Bleach will kill mold that "it comes into contact with". If you are dealing with a porous material, such as drywall, wallpaper, or wood, the bleach will only come into contact with the surface of the material. The chlorine, or sodium hypochlorite, does not, and will not penetrate into porous materials. The component in bleach that will penetrate however, and provide the one thing that mold needs to thrive, is water. Bleach is 94%-95% water.
Many websites and so-called experts recommend you use a solution of bleach and water to kill mold. They usually recommend a ratio of 1 part bleach mixed with 10 parts water (that’s roughly one cup of bleach to one gallon of water). So let’ s see, you take a product that is 95% water already and mix it with 10 times as much water. Then you expect it to be a mold killer. It doesn’t sound very strong when you look at it that way, does it?
Bleach is a great disinfectant. It is NOT a mold remover. Bleach will kill at the surface level, but it will not kill the roots. The water in the bleach will, however, penetrate to the roots. And everyone knows the best way to keep a living thing alive is to provide it with water.
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