Calcium Lime Rust
Calcium Lime Rust, more commonly known as CLR, is a household cleaning product used for dissolving stains, such as calcium, lime, and iron oxide deposits. Its ingredients may include various compounds: One formulation is (by weight) lactic acid 12-18%, gluconic acid 2.50-3.75%, lauramine oxide 1.50-3.25%, with the remainder being water. The product also contained phosphoric acid at one time, but it is now phosphate-free. Mechanism of Action. Weak acids can dissolve calcium deposits and rust without damaging the surrounding metals and plastics.