A dull marble vanity: what you can do, and what needs us.
A vanity rarely goes dull all at once. It fades in patches: around the tap, under the soap, along the front edge. Most of that is chemical, not dirt, and it decides what the fix is.
A bathroom wears marble differently from a kitchen. Less impact, more chemistry: toothpaste, hand soap, shaving products, cosmetics and nearly every bathroom cleaner on the shelf. The result is a cloudy, patchy finish that a spray and wipe cannot touch.
Dirty, or etched
Sometimes the vanity is just filmed with soap and hard-water minerals, and a proper clean brings it back. If it still looks flat after cleaning and drying, the marble has been etched: an acid has roughened the polished face at a microscopic scale, and the pale patches are the stone, not something on it. Fine scratches from grooming tools and the wrong cloth add to it, and show more on a dark stone.
What is safe at home
Clear the top, wipe the dust off dry, clean with a neutral stone cleaner and a damp cloth, and dry it fully, especially around the tap and the seams, so tap-water minerals do not dry back on. That reset fixes residue and shows you what is left. What is left is etching or wear.
Do not reach for vinegar, bleach, a descaler, a scouring pad or a countertop shine spray; those are why the vanity lost its finish. Polishing kits are a gamble on a high-visibility top: a swirl mark or a glossier patch in the middle of the vanity is worse than the dullness.
Why sealing does not fix it
A sealer reduces absorption. It does not repair etching, remove scratches or recreate a polish, and sealing a dull vanity locks the dull vanity in. The only case where a "sealer" is the answer is when the film is old sealer residue, which is stripped. Otherwise the order is correct first, seal last.
How a vanity is restored
The finish and the depth of wear are assessed; the top is deep cleaned; etching and light scratching are honed off with fine abrasives; the surface is polished back to the finish it had; chips at the edge are filled and blended; then it is sealed. It is done on the vanity, in the bathroom, and it usually sits inside a single visit that can also take the floor and the shower walls, which is why we quote a bathroom as a room.
Consistency matters in a bathroom more than anywhere: a vanity taken to the wrong gloss looks disconnected from the marble floor and the shower threshold beside it. The finish is matched to the room, not chosen from a chart.
Keeping it
Bottles on a tray, toothpaste and soap splashes wiped before they sit, the tap surround dried, and a neutral cleaner only. Light daily wiping beats an occasional aggressive clean every time.
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Related questions.
What causes water marks on marble, and do they come out?
Water marks on marble are usually one of two things, and both come out. Around a basin or on a shower ledge, a white ring or haze is mineral deposit from hard water evaporating, which strips off. A dull ring where a wet glass or bottle sat is etching, where the acidity of what was in the glass has dulled the polish, and that is honed and re-polished. The two look similar and are handled differently, so a photo helps us tell you which you have. Neither is a reason to replace the stone. Hard-water marks come off with a mild descaling pass and a stone-safe pad, because the deposit sits on top rather than in the pores. Etching is the opposite: nothing was added, a thin layer of polish was dissolved away, so it is corrected with fine abrasives until the finish is even. Wet the mark with a finger: a mineral deposit vanishes and returns as it dries, while etching looks the same wet or dry.
How long does a bathroom take?
Most bathrooms are one long day, and we need the room for the duration. Floor, vanity and shower are done in the same visit with one set-up, which is why quoting the room together is cheaper than quoting the surfaces separately. If a second coat of sealer is called for, we come back briefly the next morning. The shower waits for the sealer to cure. We give you the exact window before we leave.