STAR BRITE Mold & Mildew Stain Remover + Cleaner is your ultimate solution for stubborn mold and mildew stains. This professional-grade formula works on contact eliminating the need for heavy scrubbing. Ideal for use on fiberglass vinyl plastic formica and outdoor rated fabrics. Use it on boat tops vinyl cushions vinyl chairs vinyl canopies tile grout shower stalls toilets countertops plastic shower curtains awnings and more. Its high-alkaline triple-action formula contains buffered-bleach to remove mold stains & mildew stains chelating agents to lift ground-in dirt and surfactants to cut grease & grime. The buffered-bleach technology is better suited for marine/outdoor upholstery and outdoor acrylic fabrics including Sunbrella ensuring it won t harm stitching or threads. More effective than unbuffered bleach-water based products or diluted supermarket brands it s perfect for boats homes RVs and commercial use. NOTE: this product is not a pesticide it only removes stains caused by mold mildew fungus and algae. Directions: Just spray or wipe. Do not rinse until mildew stain disappears. Stubborn stains may require a second application and light scrubbing. Rinse well after use. Not recommended for use on all fabrics including cotton; test for colorfastness in an inconspicuous area before proceeding with overall cleaning.