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 include water, lactic acid, gluconic acid, lauramine oxide, and Propylene Glycol n-Butyl Ether. The product also contained phosphoric acid at one time, but it is now phosphate-free. The phosphate-free formula is slightly more environmentally friendly, but its effectiveness against some stains such as rust is greatly reduced.
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