Removing thick, calcified hard water stains requires breaking down hardened layers of calcium carbonate and mineral scale. Step 1: Apply a strong acidic cleaner such as undiluted white vinegar, lemon juice, or commercial CLR directly onto the calcified crust. Step 2: Allow the acid to soak and penetrate the mineral buildup for 15 to 30 minutes, keeping the surface wet. Step 3: Scrub vigorously using a non-scratch nylon scrubbing pad or a damp pumice stone for stubborn porcelain deposits. Step 4: Rinse the area thoroughly with clean water to neutralize the acid. Verification: Inspect the surface to ensure all rough white mineral crust has dissolved completely.
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