Prep first
Before you start
- Use an acidic cleaner made for lime and scale.
- Check the surface first, before any acid touches it.
- Spot-test on a hidden area before the full treatment.
- Rinse promptly and thoroughly with cold water once the scale loosens.
Hard water scale on shower heads and faucets is a white, flaky crust that forms when calcium and magnesium dry out of the water and harden. It builds up fastest where hot water evaporates quickly, and over time it can turn crumbly and sometimes tan or brown. Fresh, thin scale is easier than set-in buildup, which needs a longer soak, and natural stone has to be checked before any acid touches it.
Soak a cloth in white vinegar and hold it on thin scale for a few minutes before you scrub. If the scale is set in, citric acid for hard water stains can help, but it needs a longer soak. Yellow or rust-colored marks won't respond the same way, so check them before you reach for acid.
6 items
What you'll need
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- White vinegarThe soak for removable shower heads and faucet parts. (opens Amazon)
- Large sandwich bagHolds the vinegar around a fixture so it stays submerged.
- Acidic cleaner made for lime and scaleFor tile, glass and sinks that aren't natural stone. (opens Amazon)
- Old toothbrushScrubs the face of a shower head where the holes clog.
- Soft towelsDry the parts after the rinse and after every use.
- Cellulose sponge (opens Amazon)
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6 steps
Step by step
Step 1 of 6
Check whether the surface is natural stone
Look at what the stain sits on before anything touches it. If it's marble, limestone, travertine or granite, skip every acid in these steps and get a professional opinion. If you can't tell what the surface is, treat it as stone and hold off.
Careful. Vinegar, lemon juice and acid descalers etch and dull marble, and the strong lime remover isn't recommended for any natural stone.
Step 2 of 6
Spot-test on a hidden area first
Pick a spot nobody sees, like the back of a shower head or the underside of a faucet lip. Dab a small amount of the cleaner you plan to use, wait the same time you'd use on the stain, and look for dulling, a color change or roughness.
Tip. If the spot looks different in any way, don't go on with that product.
Careful. Keep contact short on the test and on the real stain.
Step 3 of 6A few hours
Soak removable parts in white vinegar
Remove the shower head or any faucet part that comes off easily, and put it in a large sandwich bag filled with white vinegar. Submerge the scaled pieces fully so the vinegar reaches every crusted area, then leave them for a few hours. Use white vinegar only, since colored vinegar can leave its own stain.
Step 4 of 6
Rinse thoroughly with cold water
Take the parts out of the bag and rinse each one promptly and thoroughly with cold water until no vinegar smell or loose scale remains. Check that the spray holes or faucet aerator are clear, then dry everything with a towel before you put it back.
Step 5 of 6
Wipe flat surfaces with a lime cleaner
On tile, glass or a sink that isn't natural stone, apply an acidic cleaner made for lime and scale to the stain with a sponge. Work it onto the tile or glass face only, then rinse with cold water.
Tip. Keep the sponge damp rather than soaked, so the cleaner stays where the scale is.
Step 6 of 6
Dry the surface and check the stain
Dry the cleaned surface with a towel and look at the stain in good light. If a faint mark remains, repeat the soak or wipe rather than scrubbing harder.
If you'd rather buy than mix
Best products for hard water
Choose a cleaner labeled for lime and scale, which is an acidic product, and skip chlorine bleach products. Check the label for the surfaces it's approved for before you buy.
Amazon Basics Microfiber Cleaning Cloths
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on these surfaces, 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.
See what to do for what you're seeing →Heavy buildup usually takes more than one round.
Heavy or long-standing buildup →When to call a professional →Pick what it is on
Hard Water on every material
Kitchen & bath12
Car3
Floors4
Clothes & laundry1
Shoes & accessories1
Walls1
Carpet & rugs1
Other4
No match. Try the main search for anything else.
How to tell it's working
The white crust should soften, lift and wipe away, leaving the surface bright. If a crusty mark is still there after a second round, or the finish looks dull, move to the set-in section.
What changes for yours
Adjust for where the stain is
Steam and scrub pads
Steam and scrub pads aren't needed; the vinegar soak and lime-and-scale cleaner do the job. If you do scrub with a pad, keep it to a surface you've already spot-tested, and only after the soak and rinse.
Scrubbing can dull a finish, so use light pressure and stop if the surface starts to look different.
Bathroom fixtures
In a bathroom, the shower head and faucet are where scale builds fastest, so they get the vinegar soak first. Keep the rest of the room on its own surface guide, since a shower wall or tub with a different finish may not take the same steps. The Showers & Glass Doors guide covers glass and tile in more detail.
If the scale is on a sink or toilet, check the Sinks and Toilets guides before you start. Those fixtures can take different cleaners than a shower head does.
Yellow, orange and rust-colored marks
Scale itself looks white, and it can turn tan or brown as it builds up, so a colored mark may not be scale alone. Start with the spot test on a hidden area, then apply the steps only if the surface takes them.
If the color stays after the soak and rinse, stop and use the Metal, Chrome & Tools guide, since the mark may come from metal rather than hard water.
Heavy or long-standing buildup
Old scale that has built up for a long time is thicker and harder to shift, so one soak may not be enough. Take the parts apart where you can, and soak the scaled pieces in white vinegar for a few hours again.
If the flow is still low, scrub the scaled face of the shower head with an old toothbrush. For a stronger step, mix equal parts strong lime remover and warm water, apply it to the scale for 2 minutes at most, then scrub gently and rinse with cold water.
Check the flow after the rinse, and only repeat once. If the scale is still there after that second round, the deposit is likely too deep for a home treatment, so get a professional opinion.
Vinegar, baking soda, peroxide and more
Do home remedies work on hard water?
Most kitchen remedies don't dissolve mineral scale, so white vinegar and a lime-and-scale cleaner are the only ones to use. Skipping these is the right call, and each one has a clear reason.
Works1Skip5Avoid1
What makes it worse
Mistakes to avoid
Don't mix chlorine bleach with any acid cleaner
Chlorine bleach mixed with vinegar, descalers, toilet-bowl cleaners or rust removers can release a hazardous gas. Bleach is alkaline, so it isn't recommended for hard water stains even on its own.
Don't leave a strong lime remover on too long
Two minutes is the most you should leave a strong lime remover on any surface, and that limit applies to the set-in treatment too. Longer contact is what damages finishes, so rinse as soon as the time is up.
Don't use a strong lime remover on the wrong materials
It can strip finishes and pit some metals, so keep it off wood, clothing, wallpaper, carpeting, brass, copper, aluminum, galvanized metal and any painted, coated or sealed surface. If your fixture is finished in one of those, the vinegar soak is the safer route.
Don't put a strong lime remover in appliances
Steam irons, steamers, espresso machines, water heaters and ice makers have parts that its acids aren't made for. Scale inside those appliances belongs with a professional, not a home treatment.
Don't use vinegar on cement grout
Cement grout can't take vinegar, so keep the soak to removable fixtures. For grout lines, use the Grout guide, which covers that surface in more detail.
Troubleshooting
If the stain is still there
Pick what you're seeing:
A diluted descaler did not clear the scale
CLR allows a repeat at full strength if needed. Keep the 2-minute contact limit and rinse with cold water.
Drinking glasses stay cloudy after descaling
The cloudiness may be etching, which is tiny cuts in the glass. CLR says etching cannot be removed.
Scale returns within weeks
Dry fixtures after each use. For a lasting fix, a water softener reduces scale throughout the home.
When to call a professional
If scale has built up inside a water heater, espresso machine, steam iron or ice maker, call a professional rather than trying a strong treatment. Natural stone that acids can't safely touch is also a job for a pro, who can check the finish before anything is applied.
Questions
What do hard water stains look like, and what causes them?
They look like white, flaky scale that can turn crumbly and tan or brown as it builds up. The cause is calcium or magnesium in the water that combines with bicarbonate, and as the water dries, those minerals become solid calcium carbonate and magnesium carbonate.
Why are my hard water stains yellow, orange, or green?
Scale itself is white, so a yellow, orange, green or rust-colored mark may not be scale alone. Do the spot test first. If the color doesn't lift after the soak and rinse, the Metal, Chrome & Tools guide is the next place to look.
Do bleach and other household products remove hard water stains?
No. Chlorine bleach isn't recommended here, since it's alkaline, and mixing it with any other cleaner is a bad idea. Other household products aren't needed, so use the vinegar soak or a lime-and-scale cleaner instead.
How can I stop hard water stains from coming back?
Towel-dry shower heads and faucets after each use, since scale forms as the water dries. Drying the fixture removes the water before the minerals can settle and harden.
Does white vinegar work on hard water stains?
Yes, for removable shower heads and faucet parts. It's the gentlest first choice here, and it works best when the parts can sit submerged for a few hours.
Can I use a strong lime remover on a shower head?
Only on a fixture that can take it, and only with the mix and time limit in the set-in section. Check the fixture's finish first, since the strong remover isn't for every metal.
Related
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.