Mr. Muscle Mold & Mildew Killer's quick-action formula immediately attacks mold and mildew to the roots to kill them completely and remove stain build-up easily. There is no need to scrub, just spray directly on surfaces and let it get to work. It easily removes mold, water marks, mildew, soap scum and dirt, and it disinfects and deodorizes as it cleans. It is great for tiles, rubber mats and shower curtains too!