No, hydrogen peroxide will not get rid of hard water stains or calcium scale. Hydrogen peroxide is an oxidizing agent specifically designed to lift organic stains, blood, mold, mildew, and food discoloration through chemical bleaching. Hard water spots and mineral scale, however, are alkaline mineral deposits composed of calcium carbonate and magnesium that require an acidic cleaner—such as white vinegar, citric acid, or CLR—to break down and dissolve. While hydrogen peroxide sanitizes surfaces, it lacks the acidic properties needed to eliminate hard water rings. Verification: Use an acid-based cleaner rather than hydrogen peroxide when attempting to dissolve hard water scale.
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