3M Acid Bowl Cleaner is a ready-to-use product formulated to tackle tough rust stains and hard water mineral deposits commonly found in toilet bowls and urinals. Its 9% hydrochloric acid formula penetrates and loosens buildup quickly and thoroughly, while the fresh mint-wintergreen fragrance provides a pleasant cleaning experience. For optimal results, remove water from the bowl before application and scrub with a suitable scouring pad. Always refer to the Material Safety Data Sheet (MSDS) for detailed safety information.