Bio-Clean Hard Water Stain Remover cleans your shower doors, windows, glass and even pots and pans. This incredible product is abrasive based and made from a non-chemical compound. Rest assured, the WSR20 is unlike any other cleaning product out there and performs to your hearts content. Bio-clean effectively removes: Water spot stains Mineral deposits, Soap scum, Mildew, Rust, Tree sap, Paint over spray, Oxidation deposits. Works great on: Shower doors, Chrome, Windshields, Tile and Fiberglass Porcelain, Windows, Boats, Glass, surfaces Hard, vinyl, Stainless Steel, Corian, Anodized brass and Aluminum, Pots and Pans (non-stick). This professional strength cleaner is recommended for use in hospitals, nursing homes, manufacturing plants, hotels, supermarkets and public facilities with surfaces that need cleaning and need to stay clean.