Banish is a 20% phosphoric acid bowl cleanse for cleaning ceramic tile, grout & bathroom fixtures. It is absolutely amazing in its ability to restore luster and brightness to shower stalls, bathroom tile, grout, bathtubs, sinks, toilet bowls, urinals, fiberglass & more! Banish attacks hard water and lime deposits, soap film, body oil, rust stains, mildew stains, oxidation & corrosion with incredible swiftness and power. Safe on ceramic tile, plastic, & metals except zinc & aluminum. Banish is also highly effective on coffee makers, tea kettles, humidifiers, dishwashers, washing machines, drinking fountains & more!