3M™ Heavy-Duty Bowl Cleaner, Liquid, 1 qt. Bottle, 12/Carton (MMM34764) Case of 123M Heavy Duty Bowl Cleaner Heavy duty toilet bowl cleaner contains 23% hydrochloric acid for a deep clean. Removes the most difficult rust stains and hard water mineral deposits from toilet bowls and urinals. Ready to use formula requires no mixing. Global Product Type: Bowl Cleaners Application: Bowl Cleaner Applicable Material: Ceramics; Enamel; Metal Chemical Compound: Hydrochloric Acid Dirt Types: Grime; Lime; Mineral Scale; Organic Matter; Rust;