Prep first
Before you start
- Scrub with warm water and a white nylon pad for at least 60 seconds.
- Use an acidic cleaner made for lime and scale, and test it on a hidden spot first.
- Rinse promptly with cold water, then towel-dry the area.
Hard water on grout is the white, flaky crust left in the lines around showers and faucets, sometimes tan or brown once it has built up. Whether it lifts depends on the grout: once the stain becomes part of cement-based grout it may not fully come out, while epoxy grout can recover its original shade with the right cleaning. Start gentle, since fresh deposits come off more easily than set-in ones.
Colored and shower grout both need a patch test before you commit to a product. Work with a soft brush and warm water on fresh deposits, then let the lines dry before you judge the result. If the crust has set into cement grout, the acidic lime cleaner from step 2 is the one to try, and only on a small area first.
Before you start
What grout can take
Safe to use4
- Water
- Hot water
- Enzyme cleaners
- Heat, once the stain is out
Use with care5
- Soaking
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Acids (vinegar, lemon)
- Scrubbing and abrasives
6 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- White nylon pad or soft nylon brushThe recommended scrub tools for grout. (opens Amazon)
- Acidic cleaner made for lime and scaleMineral deposits need an acid, at a pH below 7, to dissolve. (opens Amazon)
- Gentle cleaner made for tile and groutFor the second pass when a faint stain remains. (opens Amazon)
- Mop or wet vacuumPicks up the dirty solution before it dries. (opens Amazon)
- Clean water and a bucketFor the rinses, which should be thorough. (opens Amazon)
- TowelFor drying shower heads and faucets after each use.
As an Amazon Associate we earn from qualifying purchases.
6 steps
Step by step
Step 1 of 61 minute
Scrub with warm water first
Wet the grout with warm water and scrub the stain with a white nylon pad for at least 60 seconds. Rinse with clean water and look at the grout while it's still damp, then again once it has dried. Fresh deposits sometimes lift with this alone, but older scale usually needs the next steps.
Tip. Work along the grout lines, not across the tile face.
Step 2 of 6
Test the lime cleaner first
Pick an acidic cleaner made for lime and scale, since mineral deposits need an acid to dissolve. Leave chlorine bleach on the shelf, because it is alkaline and not recommended for hard-water stains. Put a little on a hidden spot, let it dry, and check that the grout and tile look the same as before.
Careful. Vinegar, lemon juice and acid descalers etch or dull marble and other natural stone.
Step 3 of 62 minutes
Apply the cleaner and scrub
Apply the lime cleaner to the stained grout only, and scrub gently with a white nylon pad while it's on. Keep it on for no more than 2 minutes, and work one small section at a time so it never sits and dries on the tile.
Tip. If the stain lightens but doesn't clear, move on to the next step rather than leaving the acid on longer.
Careful. Acids dissolve cement-based grout, so don't stretch the contact time.
Step 4 of 6
Rinse and pick up the solution
Rinse promptly and thoroughly with cold water, then pick up the dirty solution with a mop or wet vacuum before it dries. Rinse once more with clean water and let the area dry fully.
Careful. Leftover cleaner leaves a sticky film that attracts dirt.
Step 5 of 6A few minutes
Use a gentle grout cleaner if needed
If the stain remains, apply a gentle cleaner made for tile and grout and let it sit a few minutes without drying. Agitate it with a soft nylon brush or nylon pad, then pick up the solution and rinse with clean water.
Step 6 of 6
Dry the fixtures after showers
Towel-dry the shower heads and faucets after each use to slow new buildup. Scale builds fastest where hot water evaporates quickly, so those are the spots to dry first.
If you'd rather buy than mix
Best products for hard water on grout
Pick a grout cleaner made for tile and grout, and read its label for the surfaces it's safe on before you buy.
Zep Grout Cleaner & Brightener
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on grout, 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
Once the grout has dried, it should look even in color, with no white haze, crust or flaky patches left. Damp grout always looks darker, so check it after it dries before you decide the job is done.
What changes for yours
Adjust for your grout
Dark grout
Scale on dark grout shows up as a pale haze or white ring, so it's easy to see and easy to over-clean. Start with the warm-water scrub and the tested lime cleaner, and keep contact short so the grout's color stays even.
Check the result after the grout dries, because wet grout looks darker than it will once it's done.
Tile grout
Tile grout takes the same steps, but the tile face needs care too. Keep the lime cleaner on the grout lines and rinse the tile right after, since strong acid can dull glazed tile.
For marble, limestone or granite tile, don't use any acid cleaner, and see the Marble & Natural Stone guide for those surfaces.
Colored grout
Colored grout can lose its shade if strong acid touches it, so the lime cleaner should never be stronger than the steps describe. Work on a small hidden spot first, and check the color after it dries before doing the rest.
If the test spot changes color, stop, rinse, and let the grout dry before you decide on anything else. Only continue once the color looks the same as it did before the test.
Shower grout
Shower grout meets hard water with every shower, so scale returns quickly unless you dry it off. Towel-dry the shower heads and faucets after each use, since scale builds fastest there.
For the glass doors around the shower, see the Showers & Glass Doors guide, which covers that surface.
Black grout
Scale on black grout shows as a pale, crumbly ring that stands out against the dark background. Use the same steps, starting with warm water and a white nylon pad, and keep the lime cleaner's contact short.
Check the grout after it dries, since a dull or faded patch on black grout shows clearly. If a patch looks faded, stop and rinse before any further cleaning.
Heavy or long-standing buildup
Old scale that has built up over time is harder to lift, and it can sit deep in the grout's pores. Once it dries, it looks tan or brown and crumbly, and a single pass often just smears the top layer.
For these stains, use the lime remover as a second round: mix equal parts lime remover and warm water, apply it, and keep it on no longer than 2 minutes. Rinse with cold water, then repeat the scrub with a white nylon pad.
If the stain still won't come out, try pressurized steam, which can clean stains that resist conventional cleaners. On cement grout, you can also repeat the alkaline-cleaner dwell: 3 to 4 minutes, a 60-second nylon scrub and a rinse. Stains in cement grout can become part of the grout and may never fully clear, while epoxy grout can be cleaned back to its original color.
Vinegar, baking soda, peroxide and more
Do home remedies work on hard water on grout?
Most household remedies don't dissolve mineral scale, so a lime cleaner is the one that does. Every option has a clear reason behind it, so you won't reach for the wrong thing.
Skip5Avoid1
What makes it worse
Mistakes to avoid
Don't reach for chlorine bleach
Bleach is alkaline and isn't recommended for hard-water stains, so it won't dissolve the scale. Mixing it with vinegar, descalers or rust removers is far more dangerous, and that's why it stays out of every step.
Don't use vinegar on cement grout
Vinegar is the common home fix, but it's an acid, and acids etch cement-based grout. General bathroom cleaners and ammonia break down the sealer, so keep those away too and stick to the lime cleaner from the steps.
Don't use strong acid to speed things up
Strong acid solutions make grout lose its color or become powdery, and they dull glazed tile. If one step doesn't clear the stain, move on to the next gentle step rather than making the cleaner stronger.
Don't use oil- or wax-based cleaners
Oil and wax cleaners leave a film in the grout that holds dirt. Stick to warm water, the lime cleaner and the tile-and-grout cleaner from the steps.
When to call a professional
For deeply set or especially stubborn grout stains, contact the grout maker's technical support. Acid cleaning for heavy buildup, such as efflorescence, needs extreme care, so a professional is the safer choice for that.
Questions
Does white vinegar remove hard water stains from grout?
Not on cement grout. Acids etch it, so vinegar can dull the surface. Use an acidic lime cleaner on a hidden spot first, as the steps describe.
Can I use chlorine bleach to whiten grout with hard water stains?
No. Bleach doesn't dissolve mineral scale, and it's not recommended for hard-water stains. The lime cleaner in the steps is the right tool for that.
Why do hard water stains keep coming back?
Scale forms as water dries, and it builds fastest on shower heads and faucets where hot water evaporates quickly. Towel-drying those after each use slows new buildup and keeps the grout cleaner longer.
Can hard water stains come out of black grout?
Yes, with the same steps. Test a hidden spot first, since strong acid can change the color of grout. Rinse thoroughly and check the color after it dries.
Is steam safe for hard water stains on grout?
Pressurized steam can clean stains that don't respond to conventional cleaners, so it works as a last option. Use it only after the scrub and cleaner steps have failed to clear the stain.
Does epoxy grout clean up better than cement grout?
Epoxy grout can be cleaned back to its original color, while stains in cement grout can become part of the grout. Test the cleaner on a hidden spot either way.
Can I use a lime cleaner on natural stone tile?
No. Acid cleaners etch marble and dull other natural stone, and they aren't recommended for granite either. Clean only the grout lines and keep acid off the stone.
Hard Water on other materials
Other stains on grout
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.