Symptoms
- Dull, cloudy spot where a shiny stone surface used to be (etching)
- Discolored area that looks darker or different in color (staining)
- Etching often near a kitchen or bathroom from acidic products
- Stains from oil, wine, or other absorbed liquids
Likely causes
- CommonAcidic substances contacting the stone (vinegar, citrus, some cleaners)Acids react with calcium-based stones like marble and travertine, dulling the polished surface, known as etching.
- CommonAbsorbed liquids soaking into unsealed or under-sealed stonePorous stone can absorb oils, wine, and other liquids that then show as a stain.
- PossibleUsing the wrong cleaning product on natural stoneMany all-purpose or bathroom cleaners are too acidic for stone floors.
- PossibleSealer wearing off over time, leaving the stone more vulnerableStone sealers need periodic reapplication to keep protecting against stains.
What to do
- Determine whether the issue is etching (dull spot, same color, no texture change beyond dullness) or staining (color change, may extend below the surface).
- For light etching, a marble/stone polishing powder applied with a damp cloth and buffed in a circular motion can often restore the shine.
- For deeper etching, a stone honing and polishing service may be needed to properly restore a uniform finish.
- For a stain, identify if it's oil-based or water-based, since the removal method (a poultice) differs slightly for each.
- Make a poultice using a stone-safe stain-removing powder mixed into a paste, apply it over the stain, cover with plastic wrap, and let it sit as directed (often 24–48 hours).
- Remove the poultice, rinse, and check if the stain has lifted; repeat if needed for stubborn stains.
- Once clean, reseal the stone with a penetrating stone sealer to help prevent future etching and staining, and switch to pH-neutral stone-specific cleaners going forward.
Tools and parts
- Soft cloths
- Stone polishing powder
- Stone-safe poultice
- Plastic wrap
Stone floor sealerSearch: “penetrating natural stone sealer”
Marble polishing powderSearch: “marble polishing powder kit”
When to call a pro
Call a stone restoration professional for widespread etching or a stubborn stain that doesn't respond to a poultice treatment.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.