How to Remove Hard Water Stains From Glass Shower Doors

Hard water spots on shower glass aren't ordinary dirt. They're mineral deposits, mostly from calcium and magnesium, left behind as water evaporates. Soap residue can build into the same film, which is why a quick spray and wipe usually doesn't change much.

Before you start, check the door manufacturer's care instructions. Some shower glass has a factory-applied water-repellent coating, and the cleaner that is safe for plain glass may not be safe for that coating. Also look at the frame, hardware, threshold, and walls around the door. Vinegar can dull marble, travertine, limestone, and other acid-sensitive stone.

For uncoated glass, start with equal parts white vinegar and warm water. Spray enough to leave the glass wet, not lightly misted. If the manufacturer allows vinegar and the diluted mix barely touches a heavy deposit, you can try straight white vinegar on a small test area.

Give it ten to fifteen minutes. Keep the glass wet during that time because the cleaner only works while it stays in contact with the deposit. On a vertical door, press a vinegar-soaked microfiber cloth against the worst area so the solution doesn't run straight into the shower pan.

Work the wet glass gently with a white non-scratch pad or soft microfiber cloth. Skip steel wool, razor blades, green scrub pads, and powdered abrasives unless the door manufacturer specifically approves them. They can scratch the glass, damage a coating, or mark the metal around it.

Rinse the door completely, then dry it with a clean microfiber cloth or squeegee. Drying shows what is still on the surface and keeps the rinse water from leaving a new row of spots.

If one or two rounds don't remove the film, use a product labeled for mineral deposits on shower glass and follow its directions exactly. Some oxalic acid cleansers are labeled for shower glass, but they should stay off natural stone and should never be combined with vinegar, bleach, or another cleaner. Ventilate the room and rinse between products.

A haze that doesn't improve after the removable buildup is gone may be etched glass. Etching is damage to the surface, so another round of cleaner won't fix it. A glass restoration company can tell you whether the panel can be polished or needs to be replaced.

The easiest prevention takes less than a minute. Squeegee the door after the last shower of the day and leave it open long enough to dry. Less water left on the glass means fewer minerals left behind.

This comes up most on deep cleaning jobs. All cleaning tips.