Prep first
Before you start
- Blot standing water with a paper towel right away.
- Clean with a neutral stone cleaner, then rinse and dry with a soft cloth.
- If the mark stays, move on to the poultice.
Hard water on marble leaves white, chalky or crusty marks as the water dries and the calcium and magnesium stay behind. Marble can't take acid, so the cleaning has to stay gentle, and a mark that has set usually needs a poultice left on for a day or two. Expect some stains to fade over several rounds, and deep rust may never come out fully.
On a fresh mark, a stone-safe pH neutral cleaner on marble tile or a marble floor is enough, so skip the vinegar. Once it has dried into the stone, a poultice does the heavy lifting, so give it the full time rather than rushing. If a marble shower or countertop still looks chalky after a couple of rounds, that's the point to call a stone restorer.
Before you start
What marble & natural stone can take
Safe to use1
- Water
Use with care5
- Chlorine bleach
- Oxygen bleach
- Solvents (alcohol, spot removers)
- Scrubbing and abrasives
- Heat, once the stain is out
Avoid1
- Acids (vinegar, lemon)
7 items
What you'll need
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- Paper towelsTo blot standing water without spreading it. (opens Amazon)
- Mild soapFor the first flush of the area. (opens Amazon)
- Neutral stone cleaner or stone soapFor the main cleaning, made for stone. (opens Amazon)
- Soft clothsTo rinse and dry without scratching the surface. (opens Amazon)
- White absorbent powder (kaolin, diatomaceous earth, whiting or talc)The base of the poultice. (opens Amazon)
- Plastic wrapTo cover the poultice while it works. (opens Amazon)
- Distilled waterFor the final rinse after the poultice.
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6 steps
Step by step
Step 1 of 6
Blot any standing water
If water is still standing on the marble, blot it up with a paper towel right away. Work from the edge of the spot toward the middle so the water doesn't spread.
Careful. Wiping spreads a fresh spill across the stone, so blot instead.
Step 2 of 6
Flush the area with mild soap
Flush the area with water and a little mild soap, then rinse it several times with clean water. Dry it with a soft cloth so the stone is left clean.
Step 3 of 6
Clean with a neutral stone cleaner
Clean the marble with a neutral stone cleaner or stone soap, working gently with a soft cloth. Pick a product labeled for stone, and skip anything acidic or bleach-containing.
Careful. Scouring powders, creams and scrub pads can scratch marble and make etches worse.
Step 4 of 6
Check the mark at a low angle
Hold a light low across the surface and look at the mark. A dull spot is an etch, not a stain, and it needs polishing rather than stain removal. A mark that stays white or chalky is a deposit, so move on to the poultice.
Tip. If the mark is gone at this point, you can stop here.
Step 5 of 624 to 48 hours
Apply a poultice to stubborn marks
Mix a white absorbent powder (kaolin, diatomaceous earth, whiting or talc) with the neutral stone cleaner to a peanut-butter paste. Spread it 1/4 to 1/2 inch thick over the mark, cover it with plastic, and leave it for 24 to 48 hours.
Careful. Never use whiting or iron-type clays with acid chemicals in a poultice; the reaction cancels it.
Step 6 of 6
Rinse and repeat if needed
Remove the poultice and rinse the area with distilled water. If the mark is still there, repeat the poultice, since difficult stains may take up to five applications.
If you'd rather buy than mix
Best products for hard water on marble & natural stone
Choose a neutral stone cleaner or stone soap, and a white absorbent powder such as kaolin or talc for a poultice. Check the label for stone before you buy.
Granite Gold® Daily Cleaner
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on marble & natural stone, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
Heavy buildup usually takes more than one round.
Heavy or long-standing buildup →When to call a professional →How to tell it's working
When the mark is gone, the stone looks even from every angle and the polish matches the marble around it. If a mark still shows after rinsing, go back to the poultice for another round rather than cleaning harder.
What changes for yours
Adjust for your marble & natural stone
Calcium and lime deposits
Lime that has built up into a flaky, crumbly, or tan and brown crust is heavier than a light white film, so expect to need the poultice more than once. A heavier crust is a reason to give the poultice another round, not a reason to scrub harder.
Keep the poultice layer even across the whole deposit so it stays in contact with the crust for the full 24 to 48 hours. Rinse with distilled water when you remove it, and check the mark at a low angle before you decide on another round.
Marble tile
Clean marble tile one piece at a time, so the cleaner doesn't dry across the grout and the neighboring tiles. Blot, flush, and clean each tile as you go, then dry it with a soft cloth before moving to the next.
If a haze sits in the lines between tiles, that's a different surface, so see the Grout page for that.
Marble floor
Work a small section at a time on a floor, and keep foot traffic off any area with a poultice on it. The poultice needs its full 24 to 48 hours under plastic, so plan the cleanup for a time when the room can stay closed off.
When you're done, dry the floor with a soft cloth. Water left on the floor after mopping is what starts new marks, so don't leave it to sit.
Marble shower
Shower heads and faucets build up fastest, because hot water evaporates quickly there. Towel-dry them after each use to slow new buildup, and keep the marble around them dry too.
The same steps apply to the marble around a fixture, but a mark that stays after the flush and cleaner should go straight to the poultice rather than a longer soak.
Marble countertops
Countertops take splashes from the sink and from cooking, so blot up water right away and keep the area around the faucet dry. Marble holds up well against heat, but put a trivet under hot pots and pans.
The cleaning steps don't change on a counter. Just keep the poultice off the edges and the sink lip so it stays where you put it.
Cultured marble
Cultured marble is a manufactured surface, and the stone rules here don't cover its finish, so don't guess at its cleaner. Start with the mildest step: blot the water, then flush with water and mild soap and dry it with a soft cloth.
Test any cleaner on a hidden spot first. If the mark doesn't lift, the safe next step is a call to someone who works with that finish, not a poultice.
Sinks, vanities and bathroom marble
Vanity tops and bathroom sinks get water every time someone washes, so the marks usually form around the faucet and the drain. Blot any puddles right away, then use the same flush, clean, and check sequence.
Wipe the sink edges dry after use, and keep the area around the drain free of standing water.
Black, white and polished marble
The steps are the same whether the marble is black, white, or polished. Polished marble shows etches and dull spots most clearly, so look at it at a low angle before and after each step.
A poultice can dull polished stone, so keep it to the mark and check the polish after every round.
Heavy or long-standing buildup
An old faucet footprint has had time to dry into the stone, so one pass with the cleaner usually won't lift it. Go straight to the poultice and leave it 24 to 48 hours under plastic.
Once it has dried in, the mark can take up to five applications, and each round needs a distilled-water rinse before you check it at a low angle. Some old water marks may fade without ever coming out completely.
After the poultice, the mark may be lighter but still visible, and a poultice can dull polished stone, so check the polish each time. If the mark is still there after repeated poultices, a professional stone restorer is the right next step.
Vinegar, baking soda, peroxide and more
Do home remedies work on hard water on marble & natural stone?
Most household remedies belong to fabric or kitchen cleanups, and several of them are unsafe on marble. A neutral stone cleaner, mild soap and a poultice are all marble needs, so you can skip the rest.
Skip5Avoid1
What makes it worse
Mistakes to avoid
Don't use vinegar or lemon on marble
Vinegar, lemon juice and acidic descalers etch and dull marble, leaving a dull spot that needs polishing. Skip them even on a small mark, since the damage is to the surface itself.
Don't mix bleach with other cleaners
Chlorine bleach gives off hazardous gas when mixed with vinegar, descalers, toilet-bowl cleaners or rust removers, and it creates a toxic, lethal gas with ammonia. Bleach is also alkaline and isn't recommended for hard-water stains, so leave it out entirely.
Don't use acid-based lime cleaners on marble
Acid-based lime cleaners aren't recommended for natural stone, because their acids strip the seal and penetrate the stone. Keep them off marble, granite and other natural stone, and off any sealed or coated surface.
Don't reach for a rust remover
Rust removers containing hydrofluoric acid attack all stone, marble included. Keep them off the marble even when a mark looks rusty.
When to call a professional
Call a professional stone restorer if an etched area won't come out, if the marble has deeper scratches or nicks, or if a stain stays after repeated poultices. Deep rust or copper stains also need a restorer, since they may stay permanently marked. Periodic professional refinishing keeps the polish even on marble that gets regular cleaning.
Questions
How do I safely remove hard water from marble tile?
Blot any standing water, then clean the tile with a neutral stone cleaner, never vinegar or lemon. Rinse with clean water and dry with a soft cloth. If a mark stays, move on to the poultice.
What's the best hard water stain remover for marble?
A neutral stone cleaner or stone soap is the right choice for marble, since it's made for stone and avoids the acids that etch it. For a mark that stays, the white absorbent powder goes into the poultice rather than a stronger spray.
Why does my marble look dull after cleaning?
The surface has probably been etched, which dulls the polish rather than staining the stone. Check it at a low angle, and if the dull area is there, the polish needs restoring rather than more stain removal. A stone restorer can polish it back.
Can I use bleach on marble to remove hard water stains?
No. Chlorine bleach is alkaline and isn't recommended for hard-water stains on marble, so skip it. For a mark that stays, the poultice is the safer next step, and a stone restorer can handle whatever is left after that.
What is the white stuff on my marble?
It's usually hard-water scale: calcium or magnesium from the water, left as solid calcium carbonate or magnesium carbonate when it dries. As it builds up, it can flake, crumble, or turn tan or brown.
Will hard water permanently ruin marble?
Most marks lift with the steps above, but some old stains may never come out completely. Etching is a dulling of the surface that needs polishing, so it's a different problem from a deposit.
How long should a poultice stay on marble?
A poultice stays on for 24 to 48 hours under plastic, then gets rinsed off with distilled water. Check the mark afterward, and repeat the poultice if it's still there.
Hard Water on other materials
Other stains on marble & natural stone
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.