How to Clean Frameless Glass Shower Doors (and Stop Hard Water Spots for Good)

A frameless shower looks incredible on day one. Six months later, many homeowners are staring at a cloudy film of mineral spots and wondering what went wrong. The good news: keeping glass clear is mostly about a few small habits, not scrubbing. This guide gives you the routine we recommend to every Eastern Glass customer, explains why South Florida water is harder on glass than most places, and tells you exactly which products to keep away from your enclosure.

Why glass shower doors get spotty in South Florida

When water dries on glass, it leaves behind the dissolved minerals it was carrying — mainly calcium and magnesium. Each drop leaves a tiny ring; thousands of rings become the white haze you see. Soap scum then clings to those rough mineral deposits, which is why neglected glass gets worse quickly.

Our tap water makes this worse. Miami-Dade, Broward and Palm Beach draw drinking water from the Biscayne Aquifer, a shallow limestone formation. Limestone is calcium carbonate, so the raw water is naturally hard. Miami-Dade’s Water and Sewer Department notes in its 2024 Water Quality Report that water from the Alexander Orr, Jr. plant “receives lime treatment to reduce hardness” before it is sent to homes. Treatment helps, but enough minerals remain to spot glass, and homes on private wells usually see even more.

The daily habit: squeegee, then walk away

Everything else in this article is optional. This step is not. After the last shower of the day, run a rubber squeegee down the inside of the glass in three overlapping top-to-bottom strokes. It takes about 15 seconds and removes the water before it can dry and leave minerals behind.

• Keep the squeegee inside the shower on a suction hook so it actually gets used.
• If you prefer, a microfiber towel works too — the goal is simply dry glass.
• Leave the door slightly open for 20–30 minutes so humidity escapes and seals dry.
• A bathroom exhaust fan run for 15 minutes after showering also reduces mildew on silicone and seals.

Weekly: a five-minute clean that is safe for glass and hardware

1. 1Spray a pH-neutral shower cleaner on the glass. Wait about 30 seconds so it can loosen soap film.
2. 2Wipe with a clean microfiber cloth. A dirty cloth can drag grit across the surface and leave fine scratches — Guardian Glass warns about exactly this in its care guide.
3. 3For light mineral residue, use diluted white vinegar (one part vinegar to one part water) on the glass only. Let it sit 5–10 minutes, then rinse.
4. 4Rinse with clean water and squeegee so no cleaner dries on the surface.
5. 5Dry the hardware with a separate cloth. Hinges, handles and clamps should never sit wet with cleaner on them.

Care by hardware finish

Most “ruined” shower doors we are called to look at have perfect glass and damaged hardware. Finishes react very differently to cleaners, so match the product to the metal.

Products that damage tempered glass and hardware

Tempered glass is strong, but its surface is still glass — and the coatings on hardware are only microns thick. These are the products behind most warranty claims we see denied:

• Abrasive powders such as Ajax or Comet powder, and polishing compounds like cerium oxide or rouge — they leave permanent micro-scratches that trap minerals.
• Scouring pads, steel wool and razor blades. Even “non-scratch” pads can mark coated glass.
• Acidic descalers (CLR, Lime-Away) and products containing hydrofluoric or phosphoric acid. They etch glass and strip plating from hardware.
• Ammonia glass cleaners on hardware. Fine on bare glass, harsh on brushed and matte finishes.
• Bleach on vinyl seals and sweeps — it makes them brittle and chalky years early.
• Steam cleaners on seals. Heat softens the vinyl so it no longer seats flat against the glass.

Removing heavy buildup that is already there

If the glass already has a thick white haze, work in stages rather than reaching for something aggressive:

1. 1Soak the area with a 1:1 white vinegar and water solution for 10–15 minutes (cover the hardware with a towel first).
2. 2Make a paste of baking soda and water and rub gently with a microfiber cloth. Baking soda is mild enough for glass when used lightly.
3. 3Rinse thoroughly and squeegee. Repeat once or twice over a few days instead of scrubbing harder.
4. 4If haze remains after that, the minerals have likely etched into the surface. A professional glass polish or, in bad cases, replacing the panel is the only fix — and a strong argument for a coating on the new glass.

Monthly: a 30-minute inspection that prevents leaks

Seals and sweeps are wear items. Plan to replace them every 3 to 5 years, sooner if they crack, turn hard or chalky, or let water through at the bottom. When buying replacements, match the channel profile and the glass thickness (usually 3/8" on frameless doors).

Are protective glass coatings worth it?

Hydrophobic coatings fill the microscopic pores in glass so water beads and runs off instead of clinging and drying in place. There are two kinds:

A note on glass type

Standard clear glass has a faint green tint from its iron content; low-iron (ultra-clear) glass removes it. Spots are equally visible on both, but low-iron glass shows the true color of your tile and makes a clean enclosure look even cleaner. If you are comparing enclosure options, our guide to frameless vs. semi-frameless shower doors covers glass choices in more detail.