This powerful, liquid toilet bowl cleaner and deodorizer dissolves even the toughest stains, including built-up lime deposits, hard water scale and rust stains without harming septic tanks. The 23 % hydrochloric acid formula is packaged in an angle-neck bottle for easier application. Use in toilets and urinals. Application: Bowl Cleaner; Applicable Material: Ceramics; Enamel; Metal; Chemical Compound: Hydrochloric Acid; Dirt Types: Bacteria; Grime; Mildew; Mineral Scale; Mold; Organic Matter; Rust; Soil; Stains.