Quickly removes stains caused by mold and mildew on contact without heavy scrubbing; EASY TO USE - spray, wait until the stain disappears, then rinse STAIN REMOVER plus CLEANER: High-alkaline, triple-action formula contains; BUFFERED-BLEACH to remove mold stains and mildew stains; CHELATING AGENTS to lift ground-in dirt; SURFACTANTS to cut grease and grime BUFFERED-BLEACH TECHNOLOGY is better suited for marine/outdoor upholstery and outdoor acrylic fabrics including Sunbrella; Won't harm stitching or threads More effective cleaning power than unbuffered "bleach-water" based products, or diluted supermarket brands Works on; awnings, fiberglass, wood, concrete, drywall, siding, tile and grout, gutters, roofs, vinyl upholstery, most outdoor acrylic fabrics, and more (test fabric for colorfastness before use) Professional-strength concentrated formula for boats, homes, RVs, and commercial use; Gallon size for use as a house wash/siding and roof cleaner with a pump sprayer Star brite products are proudly made in the USA since 1973 Do not use on wood or painted surfaces unless you plan to refinish or repaint them