Home Armor 32 oz. Instant Mildew Stain Remover is a bleach-based formula that cleans mold and mildew stains and disinfects odor-causing germs. It is twice as strong as the leading brand, making it effective for both indoor and outdoor use on various surfaces such as wood, plastic, fiberglass, concrete, brick, tile, grout, garbage cans, and outdoor furniture. It is also great for paint prep, improving the long-term appearance and performance of your paint.