Dissolves soap scum & hard water film. Kills 99.9% of germs (Comet kills most household germs including Staphylococcus aureus, Salmonella enterica, and Pseudomonas aeruginosa). Disinfects and cleans tough stains. Great on surfaces such as sealed fiberglass, glazed porcelain, stainless steel, chrome, synthetic marble, Formica (Formica is a registered trademark of The Diller Corporation), plastic and vinyl. For old or worn surfaces, test on a small area before use. Do not use on natural marble, stone, brass or colored grout. Questions? Comments? 1-800-926-9441. Visit www.cometcleanser.com.