OxiClean (which utilizes sodium percarbonate as its active ingredient) is generally not effective at removing hard water stains or calcium scale. OxiClean is a powerful oxygen-based bleaching agent designed to lift organic stains, mud, coffee, and laundry discoloration through oxidation. However, hard water spots and calcium scale are alkaline mineral deposits that require an acidic cleaner (like vinegar, citric acid, or CLR) to dissolve. While OxiClean can help brighten dingy laundry washed in hard water, it will not dissolve mineral rings in a toilet. Verification: Use an acid-based cleaner rather than oxygen bleach when attempting to dissolve hard water mineral scale.
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