Comet Ultra Bathroom Cleaner, 32 Oz. Disinfects and cleans tough stains. Great on surfaces such as sealed fiberglass, glazed porcelain, stainless steel, chrome, synthetic marble, Formica, plastic and vinyl. For old or worn surfaces, test on a small area before use. Do not use natural marble, stone, brass or colored grout. Comet Bathroom Cleaner kills most household germs including Staphylococcus aureus, Salmonella enterica, Pseudomonas aeruginosa and Escherichia coli.