TL;DR
Marble, travertine, and limestone are calcium carbonate, and acid dissolves them on contact. Vinegar, lemon, wine, citrus cleaners, and most bathroom products etch these floors permanently -- etching is dissolved stone, not a stain, and no cleaner removes it. Use a pH neutral stone cleaner only, blot acidic spills immediately, and keep the sealer current.
Etching is not a stain, and that distinction is everything
A stain is something sitting in the stone that can be drawn back out. Etching is stone that is gone. Acid reacted with the calcium carbonate and dissolved the polished surface in that spot, leaving a dull, slightly rough mark.
People often describe an etch mark as a water spot and reach for a stronger cleaner. Stronger cleaner does nothing, because there is nothing to remove. The only repair is mechanical -- honing and repolishing. That is why the wrong bottle under the sink is a bigger threat to a stone floor than any amount of dirt.
Source: marble institute of America stone care guidance.
Which stones are acid-sensitive
| Stone | Acid sensitive | Notes |
|---|---|---|
| Marble | Yes, highly | Calcium carbonate; etches in seconds |
| Travertine | Yes, highly | Same chemistry, plus natural voids |
| Limestone | Yes, highly | Softest of the three; also scratches easily |
| Onyx | Yes | Same family, often translucent and fragile |
| Granite | Much less | Silicate; acid degrades the sealer rather than the stone |
| Slate | Much less | Silicate; flakes and scratches instead |
| Quartzite | Much less | Genuine quartzite is very acid resistant |
Note that engineered quartz is not on this list -- it is a resin-bound product with a different rule set, and so is granite, which is covered in how granite countertops differ.
What etches marble
Vinegar and lemon are the famous ones, but the list is long: orange juice, wine, tomato sauce, coffee, soda, salad dressing, most bathroom and toilet bowl cleaners, descalers, rust removers, tub and tile products, and many "natural" citrus-based cleaners.
Anything with the words descaling, lime, rust, or citrus on the label should be treated as an acid until proven otherwise. Read ingredient lists. A product being marketed as gentle or plant-based says nothing about its pH.
Strong alkaline products cause a different problem -- they degrade sealer and can leave a bleached-looking patch. Neutral is genuinely the target, not just "not acidic."
The safe routine
Dry pass first. Stone floors, especially limestone and travertine, scratch, and every mop pass over grit is an abrasive pass. Dust mop with wide microfiber daily in traffic lanes, or vacuum with the beater bar off.
Then damp mop with a pH neutral stone cleaner diluted per label, on a well-wrung microfiber pad. Rinse with clean water and dry with a fresh pad. The drying step matters more on stone than almost anywhere else, because standing water in a hard-water area leaves mineral deposits and, on travertine, can sit in the surface voids.
The mechanics are in the damp mop technique, and the product identification is in why pH neutral is not optional on stone.
Travertine has one extra problem
Travertine forms with natural voids -- small holes throughout the stone. Most flooring travertine is factory-filled with grout or resin, but those fills pop out over time, especially in traffic areas.
Open voids collect dirt and hold water, and mopping pushes grime into them. If your travertine has developed pits, they can be refilled with a color-matched product, which is a restoration job rather than a cleaning one. Until then, use less water and dry more thoroughly.
Sealing: what it does and does not do
A penetrating sealer soaks into the stone and slows liquid absorption, which buys you time to blot a spill before it stains. That is genuinely valuable.
What a sealer does not do is prevent etching. Acid still reaches the surface and still dissolves it. Anyone telling you sealing makes marble acid-proof is wrong, and believing it is how floors get ruined.
Test the sealer with a water drop. If the spot darkens within a few minutes, it is time to reseal. Traffic lanes wear first, so test there rather than in a corner. The same test and the same limitation apply to stone worktops -- see cleaning natural stone countertops.
What to do the moment something spills
Blot, do not wipe. Wiping spreads an acidic spill across more surface, turning one etch mark into a smear of them.
Blot with a clean absorbent cloth, then rinse the area with plain water and blot again, then dry. Speed is the entire game with acids -- a wine spill blotted in ten seconds may leave nothing, while the same spill at five minutes leaves a permanent dull patch.
For an oil or grease mark that has already soaked in, an absorbent poultice left in place for several hours will draw much of it back out. That works for stains, not for etching.
Living with a stone floor
Put mats at every exterior door and rugs in front of sinks. Felt pads under all furniture, no dragging anything, and wipe kitchen and bar spills immediately.
Keep a bottle of neutral stone cleaner in the cabinet and get every acidic product out of the rooms with stone floors, or at least clearly separated so nobody grabs the wrong one in a hurry. That is the practical version of protecting a stone floor.
If the floor is already etched throughout, honing and repolishing restores it, and it is the same process that produced the finish in the first place. Terrazzo, which contains marble chips in a binder, faces the identical acid problem in a composite form -- see terrazzo, which contains the same marble.
FAQ
Can I use vinegar on marble floors?
No, never. Vinegar is acidic and marble is calcium carbonate, so contact dissolves the polished surface and leaves a permanent dull etch mark. This is physical damage rather than a stain, and no cleaning product will remove it. Use a pH neutral stone cleaner.
What is the difference between etching and staining marble?
A stain is a substance absorbed into the stone that can often be drawn back out with a poultice. Etching is stone that has been dissolved away by acid, leaving a dull rough spot. Stains are a cleaning problem; etching is a refinishing problem.
Does sealing marble prevent etching?
No. A penetrating sealer slows liquid absorption, which reduces staining, but acid still reaches and dissolves the surface. Sealing is worth doing and worth maintaining, but it is stain protection, not acid protection.
What cleaner is safe for travertine floors?
A pH neutral cleaner labeled for natural stone, diluted per its instructions, followed by a clean water rinse and a dry pass. Avoid anything acidic, anything abrasive, and strong alkaline degreasers that strip sealer.
Can you steam clean marble or travertine?
It is not recommended. Steam can degrade the sealer, force moisture into travertine's natural voids, and stress grout joints. A damp microfiber mop with a neutral stone cleaner achieves the same result without those risks.
How do I fix an etch mark on a marble floor?
Small dull spots on polished marble sometimes improve with a marble polishing powder used per its instructions. Anything larger, or on a honed finish, generally needs a stone restoration professional to hone and repolish the area so it blends with the surrounding floor.
When the whole house is the problem rather than one task, recurring house cleaning services are the wider option.
Stone is the surface where one wrong bottle causes damage that outlives the mistake by decades, which is why identifying your material comes before anything else. Every home is different, so what a full clean takes depends on size, condition, and what you want covered. Get a quote and we will walk you through it.