Heavy-Duty Clinging Bowl, Tile and Porcelain Cleaner. Designed to remove heavy build-up of water scale, soap scum, urinary salts, and rust from hard surfaces, this cleaner can be used to clean and deodorize wash basins, bath tubs, shower stalls, drinking fountains, toilet bowls, urinals and sinks. Contains no harmful hydrochloric or sulfuric acids.