Ring Master All-Purpose Bathroom Cleaner removes rust, scum, hard water deposit and stains from porcelain, ceramic, chrome and stainless steel bathroom surfaces. Cleaner contains a blend of mineral acids, emulsifiers, detergents, corrosion inhibitors, perfume and color indicator. Clean your toilet bowls, urinals, shower stalls, ceramic tile and most metal surfaces. Formula fights odor-causing bacteria and provides a sanitary environment on cleaned surfaces, leaving behind a pleasant, refreshing fragrance. Clinging liquid ensures complete coverage of vertical surfaces. Color changes from lime green to bright blue when rinsed or diluted with water. Formula doesn't contain strong acid fumes and won't harm septic tanks when used as directed.