Cleaning years of heavily calcified hard water stains in a shower requires powerful acid-based treatment and persistent mechanical scrubbing. Step 1: Spray or soak the stained glass doors, tiles, and fixtures with a strong acidic cleaner such as undiluted commercial CLR or concentrated white vinegar. Step 2: Allow the liquid to penetrate and dissolve the thick mineral crust for 30 to 45 minutes, keeping the surfaces wet by reapplying as needed. Step 3: Scrub vigorously using a heavy-duty non-scratch nylon scouring pad or a damp pumice stone for stubborn porcelain areas. Step 4: Rinse the entire shower thoroughly with clean water. Verification: Inspect the surfaces to ensure all rough mineral buildup is gone.
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