Kills 99.9% of bacteria and viruses when used as directed. Angled neck applicator targets hard-to-reach areas, including under the rim. Thick 9.5% hydrochloric acid formula coats above and below the waterline. Coating action provides longer contact to help dissolve tough rust stains and mineral deposits.Specially formulated to destroy hard water stains. Application: Toilet & Urinal Cleaner; Applicable Material: Toilets, Urinals; Chemical Compound: Hydrochloric Acid; Dirt Types: Grime; Mildew; Mineral Scale; Mold; Organic Matter; Rust; Soil; Stains.