Prep first
Before you start
- Brush off the dry salt before you add any liquid.
- Dab from the edges toward the center instead of rubbing.
- Rinse with cool water and blot until dry, since leftover residue attracts dirt.
- Test any solution on a hidden spot first.
Salt on a hat is usually dried residue from winter de-icing salt, or from sweat that dried and left salt behind. A fresh mark lifts easily once the crystals are brushed away and the spot is worked with cool water and a little mild soap. An old sweat ring is slower going, and heat and hot water are both ruled out for hats, so patience does more than force.
Go easy on the brim, where salt builds up the most. Hard rubbing pushes the crystals deeper and frays the weave. For sweat salt stains on hats that linger, a prewash stain remover stick does the job without soaking the crown.
Before you start
What hats & caps can take
Use with care5
- Water
- Soaking
- Enzyme cleaners
- Acids (vinegar, lemon)
- Scrubbing and abrasives
Avoid3
- Hot water
- Chlorine bleach
- Heat, once the stain is out
6 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- Soft-bristled brushBrushes off dry salt and loose dirt gently. (opens Amazon)
- White clothsA white cloth shows if dye is transferring during your test. (opens Amazon)
- Mild soapLifts the stain when mixed with cool water. (opens Amazon)
- Baking sodaMakes the paste that lifts a sweat ring. (opens Amazon)
- Dry microfiber towelBlots up moisture and dirt without rubbing. (opens Amazon)
- Crumpled paperHolds the crown's shape while the hat dries.
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6 steps
Step by step
Step 1 of 6
Brush off the dried salt
Let the residue dry completely, then brush away as much loose salt as you can with a dry, soft-bristled brush. Work in short, light strokes, and don't add any liquid until the loose salt is gone.
Careful. Adding liquid to a dry salt spill can make it worse.
Step 2 of 6
Check the label and test a hidden spot
Read the care tag and follow it over anything general here. Then test your method on a small, hidden spot, such as the inside of the band. If the tag is missing or unreadable, skip any soak and stay with brushing and dabbing.
Careful. If dye transfers to the cloth, stick to spot cleaning.
Step 3 of 6
Dab the stain with mild soap
Dampen a clean cloth with cool water and a little mild soap, then gently pat or dab the stain. Don't rub. Pat again with a fresh damp cloth to lift away the soap.
Step 4 of 615 minutes
Lift the sweat ring with baking soda
For a sweat ring, mix equal parts baking soda and water into a paste and spread it over the mark with a soft brush. Leave it on for about 15 minutes, then dab it away with a damp cloth.
Step 5 of 6
Blot the hat dry
Press a dry microfiber towel or soft cloth onto the area to lift the moisture and dirt. Blot from the edges toward the center, and don't rub it dry.
Step 6 of 6
Air dry the hat away from heat
Let the hat air dry completely at room temperature. Stuff the crown with crumpled paper while it dries so it holds its shape.
Tip. Keep it away from radiators and heaters while it dries.
If you'd rather buy than mix
Best products for salt stains on hats & caps
Plain mild soap, baking soda and a soft-bristled brush cover every step here, so you don't need a special stain remover.
Clorox 2 Laundry Stain Remover and Color Booster Powder, 49.2 Ounces
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on hats & caps, 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
You'll know it's working when the salt crust is gone and the cloth stops picking up white residue. Stop once the spot is clean and dry, rather than scrubbing for a perfect finish.
What changes for yours
Adjust for your hats & caps
Baseball caps and baseball hats
Check whether your baseball cap is structured, since that decides how far you can go. A structured cap stays with spot dabbing using a damp cloth and cool water, and it stays out of the washer and out of any long soak.
If the cap is unstructured, the longer hand-wash soak is an option for a stubborn mark. Start with the steps above, and add the soak only after the spot has been dabbed and blotted.
Hats
Caps that are not wool or wool-blend follow the steps as written. Wool and wool-blend caps are the exception: keep the work to a damp cloth and cool water on the spot, and skip any soak.
If the hat also has a visible sweat ring, add the paste step after the spot dab, then check the band before drying.
Sweat and salt on hats
Sweat leaves salt behind as it dries, so the mark usually shows as a ring along the band rather than a scattered crust. Give the baking soda paste its full wait there, because a ring is harder to lift than loose salt. If a faint ring remains after blotting, repeat the damp dab once and blot again before you dry the hat.
Keep the paste on the ring itself so the rest of the hat stays clean.
Men's hats
Men's hats usually show salt as a sweat ring along the inside of the band, so start the test and the paste there. Keep the damp cloth small so the water stays on the stain and doesn't soak the crown.
The rest of the steps are the same. Stick to cool water and the air-dry step, since the heat rules apply to every hat.
Heavy or long-standing buildup
If the mark has been there a while or survived one round of cleaning, the steps above may need a longer soak. Only an unstructured cap can take the soak, so check the cap type before you start. Soak it in a hand wash with cool water for 10 to 15 minutes, then dab, rinse, and blot as before.
If the mark dried hard, brush it again before you add any liquid, since dry residue can grind in when it gets wet. Repeat the damp-cloth dab a second time rather than using more soap, and rinse the cloth between passes. Heat won't help here either, so keep the hat away from any heat source while you work.
If the mark is still there after this, stop and leave it rather than scrubbing harder or reaching for a stronger product.
Vinegar, baking soda, peroxide and more
Do home remedies work on salt stains on hats & caps?
Plenty of home remedies float around for salt stains, but most of them don't suit a hat. Here is how the common ones compare with the steps above.
Works1Skip6
What makes it worse
Mistakes to avoid
Don't put the hat in a dryer
Heat can deform or damage caps, and a hair dryer can permanently misshape them. Let the hat air dry at room temperature; heat can deform the cap, so skip the hair dryer.
Don't use bleach on the hat
Bleach and other harsh cleaning products can damage the material, so skip them even when the stain looks stubborn. Wool and wool-blend caps also can't take enzyme cleaners or bleach at all.
Don't put a structured cap in the washer
Structured caps, wool-blend caps and caps with cardboard visors should never go in a washing machine. Spot cleaning with a damp cloth is the safe route for them.
Don't use hot water on mesh caps
Hot water can affect the dye on mesh, so keep every wet step at cool water.
When to call a professional
If the mark survives every step here, stop rather than reaching for a stronger product. These are the gentlest steps you can take, so anything stronger carries more risk than a faint mark is worth.
Questions
Can I put a hat in the washing machine to remove salt?
Usually not, and the steps above work without it. Stick to brushing and dabbing, and only consider a soak if the cap is unstructured.
How long should baking soda sit on a sweat stain?
About 15 minutes is the time to aim for. Leave the paste on the ring for that full wait, then dab it away with a damp cloth. Finish by blotting dry with a microfiber towel.
Should I use vinegar on salt stains on a hat?
No, skip vinegar on a hat. Vinegar is only listed for stubborn stains on suede shoes, so a damp cloth with mild soap is the safer choice on a hat.
What if my hat has no care tag?
Don't guess. Skip any soak, brush off the salt, and dab with cool water and a little mild soap after testing a hidden spot.
Will the salt come back after it dries?
It can if residue is left behind, because leftover salt attracts dirt. Rinse the spot with cool water and blot until dry.
How long does a hat take to dry?
There's no set time for a cap, so let it dry completely at room temperature. Don't rush it with heat.
Salt Stains on other materials
Other stains on hats & caps
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.