Rapidly removes soap scum, hard water deposits, and rust stains from tubs, toilets, sinks, showers, tile, grout, drinking fountains, and other acid resistant fixtures and surfaces. Non-corrosive mild acid. Removes soap scum, hard water deposits, and rust stains from tubs, toilets, sinks, showers, tile, grout, drinking fountains, and other acid-resistant fixtures and surfaces. High foaming formula clings to surfaces for effective cleaning. This high foaming formula clings to surfaces for effective cleaning. Formulated from environmentally responsible ingredients that are non-corrosive to skin, yet highly effective on mineral soils. Contains no non-ionic surfactants, but has a special blend of biodegradable solvents, wetting agents, corrosion inhibitors and sequestering agents. ShowerGlow Foaming Restroom Cleaner is readily biodegradable and environmentally responsible. This is a non-corrosive mild acid quickly removes soap scum, hard water deposits, and rust stains from tubs, toilets, sinks, showers, tile, grout, drinking fountains, and other acid resistant fixtures and surfaces. This high foaming formula clings to surfaces for effective cleaning.