Yes, CLR (Calcium, Lime, and Rust) really works exceptionally well on hard water stains. CLR is formulated with a powerful blend of organic acids (such as lactic acid and gluconic acid) that chemically react with alkaline calcium carbonate and magnesium deposits, breaking down their molecular bonds and transforming them into a water-soluble solution. It rapidly cuts through crusty mineral buildup on showerheads, glass doors, faucets, and tile without requiring excessive scrubbing. However, it cannot repair physical pitting or etching left behind by permanent mineral damage. Verification: Apply CLR, let it soak for a few minutes, and wipe away the dissolved mineral scale.
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