Does bleach kill mold?

On a non-porous surface, bleach can clean a small film and it can also just bleach the color out of it. On drywall, wood, and stone it mostly adds water, which is the ingredient mold wanted. The stain looks better for a week. The cavity is wetter.

Do not mix bleach with ammonia or unnamed cleaners. Do not fog a Gettysburg cellar with it. Detergent and thorough drying beat bleach for small hard-surface cleaning. Larger or porous jobs need removal.