Ring Master All-Purpose Bathroom Cleaner removes rust, scum, hard water deposit & stains from porcelain, ceramic, chrome & stainless steel bathroom surfaces. Cleaner contains a blend of mineral acids, emulsifiers, detergents, corrosion inhibitors, perfume & color indicator. Clean your toilet bowls, urinals, shower stalls, ceramic tile & most metal surfaces. Formula fights odor-causing bacteria & 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 & won't harm septic tanks when used as directed.