It is very common for individuals attempting to make a quick dollar to promise you a professional job and then run to the nearest supermarket or discount store and purchase off the counter, household bleach. BIG MISTAKE! Household bleach contains more than just sodium hypochlorite (commonly called bleach). That type of cleaner has additives to make your clothes whiter, brighter, and cleaner in general. Household bleach is great for clothes but not your home. Prowash uses industrial grade Sodium Hypochlorite in specific dilution ratios to effectively clean your home without harming your siding or the environment. Vinyl siding is shipped from the manufacture with a protective coating on the surface to help resist weathering from the elements. Household bleach suffers from several shortcomings when it comes to this protective coating.