Mildew Stain Remover quickly removes unsightly mildew stains and mold stains from fiberglass, vinyl, plastic or painted surfaces. It begins working on contact. The special buffered formula will not harm vinyl upholstery or threads. It is a better alternative to using regular bleach and contains chelating agents and surfactants to clean better than bleach alone. It can be used on the boat, around the home, on patio furniture, campers, cushions, or wherever mold stains and mildew stains are a problem. Just spray or wipe Star brite Mildew Stain Remover on most canvas T-tops, boat seats, boat covers, bolsters, vinyl cushions, vinyl chairs, bimini tops, tile, grout, shower stalls, shower curtain liners, shower mats, bathrooms, awnings, siding, wood and more. Do not rinse until stains disappear. Most stains disappear in 15 seconds to 30 seconds. Stubborn stains may require a second application and light scrubbing. Rinse well after use. For use on outdoor acrylic fabrics such as Sunbrella brand; not recommended for use on indoor fabrics or clothing; test for colorfastness in an inconspicuous area before proceeding with overall cleaning. PRO TIP: Bleach-based stain removers do not kill mold and mildew, they only remove the stains. For long term mold stain and mildew stain control, follow with a Chlorine Dioxide-based (ClO2) biocide spray like PERFORMACIDE Mold & Mildew Eliminator. This EPA registered mold, mildew, slime, and fungus killer will not remove stains, so use both products in sequence for optimal results. ClO2 also removes mildew smells and musty odors. PERFORMACIDE Mold & Mildew Eliminator does not require rinsing and leaves no harmful residue. FOR LONG TERM, PROFESSIONAL RESULTS, FOLLOW THESE STEPS: STEP 1: Remove the stains with MILDEW STAIN REMOVER STEP 2: Kill the organism with PERFORMACIDE MOLD & MILDEW ELIMINATOR STEP 3: Prevent future mildew stains with Star brite Mildew Stain Blocker (optional)