This pleasantly scented toilet bowl cleaner contains 9 percent hydrochloric acid and detergents to quickly remove rust， scale， stains， hard water mineral deposits and urine salts. Acid Bowl Cleaner is ready to use in cleaning toilets and urinals. Liquid cleaner comes in a squeeze bottle with a flip top for easy dispensing. Allow this cleaner to remain for at least 10 minutes until all rust， scale and stains are loosened. Rinse by flushing.