Removing stubborn hard water spots, calcium rings, and mineral deposits requires acid-based cleaning agents that dissolve alkaline minerals. For household glass doors, chrome faucets, and stainless steel sinks, pure white vinegar (acetic acid) or specialized commercial cleaners like CLR and Lime-A-Way work exceptionally well. For heavy mineral rings inside toilet bowls, you can use a pumice stone dampened with water to gently scour away calcified deposits without scratching the porcelain finish. Verification: Test your chosen cleaner on a small, hidden area of the fixture first to ensure it does not dull or damage the underlying surface finish.
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