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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, Propylene Glycol, n-Butyl Ether, and solvents that dissolve cobalt gel coats and paint. The product also contained phosphoric acid at one time, but it is now phosphate-free.