Servicing many customers throughout our years in business, we find that it is a common misconception that Bleach is the end all be a all to mold killing and cleaning. What we find at Trippeter Property Services is that is not the case at all. In some cases bleach can actually make mold worse because of the water content, especially trying to use it for cleaning drywall. Make sure that if you are using bleach it it on hard non-porous surface.