Squeegee after every shower
A squeegee is the single most effective habit for a marble shower. Hard water leaves its minerals behind as it evaporates, and soap leaves a film. Take the water off the walls, glass and bench before it dries, and there is far less of either to clean.
Work from the top down, then wipe the curb and the floor near the drain with a towel. Run the fan or leave the door open so the stone, grout and caulk can dry between showers.
The right cleaner, and the wrong ones
Once a week, clean with a pH-neutral cleaner labeled for natural stone, mixed as the label directs, using a soft cloth or non-scratch sponge. Rinse with clean water and dry. The Natural Stone Institute's care guidance recommends neutral cleaners and explains why acids damage marble.
Keep these out of a marble shower:
- Vinegar, lemon and citrus cleaners. The acid dissolves the surface and leaves a dull etch.
- Acidic bathroom, tub and grout cleaners and descalers. They are made for porcelain and etch marble.
- Scouring powders and cleansers. Many are abrasive, and some are acidic as well.
- Abrasive pads, melamine sponges and steel wool. They scratch and dull polished stone.
- Bleach as a routine cleaner. It can discolor marble.
Hard-water scale without acid
White crust on the walls, fixtures and door track is mineral left by evaporated water. On porcelain, an acid descaler dissolves it. On marble, the same acid dissolves the stone underneath, so scale on marble has to come off mechanically, not chemically.
For light buildup, use a non-acidic scale remover labeled safe for natural stone and follow its directions. If that does not shift it, stop there rather than reaching for something stronger. Heavy scale on polished stone is better left to us: it has to be lifted off mechanically, and a slip scratches the stone underneath.
Mildew and grout without bleach and ammonia
Black spots in grout and caulk are mildew feeding on moisture and soap. Use a stone-safe mildew cleaner, such as a peroxide-based product labeled for natural stone, and rinse well. Never mix bleach with ammonia or with acid cleaners: the fumes are dangerous.
Once a month, look at the grout and caulk. Cracked grout or caulk pulling away at the corners lets water behind the stone. Mildew that has grown into caulk usually means the caulk needs replacing, not more scrubbing.
What cleaning cannot fix
Some marks are damage in the stone, not dirt on it. Chalky white blotches that disappear when the wall is wet and come back as it dries are etching and fine scratches, usually from acidic or abrasive cleaners. Water fills the rough surface for a moment, which is why they hide. More cleaning, or a stronger product, makes them worse.
Walls that have gone evenly dull need honing or polishing, not a cleaner. Grey patches near the drain that never dry usually mean water is trapped under the tile, which is an installation question. If your walls etch easily, a honed finish hides new marks better than a polish; see marble honing.
When to call
Call when scale will not shift with a stone-safe remover, when chalky or dull patches stay after cleaning, or when tiles stay dark long after the shower has dried. Our marble shower restoration service removes buildup without acid, hones or polishes the stone, and tells you when the problem sits behind the tile. A photo of the whole wall and a close-up in side light help us plan the visit.