Quickly removes stains caused by mildew without heavy scrubbing; EASY TO USE - spray, wait until the stain disappears, then rinse Gel formula clings to vertical indoor/outdoor surfaces for longer contact time STAIN REMOVER + CLEANER: High-alkaline, triple-action formula contains; BUFFERED-BLEACH to remove mold stains & mildew stains; CHELATING AGENTS to lift ground-in dirt; SURFACTANTS to cut grease & 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