How to Wash a Hat Without Ruining It or Losing Its Shape

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Your favorite hat is a mess.

Sweat stains, salt lines, and you know it smells. But you haven’t washed it, because you don’t want to ruin it.

You’ve heard what happens when you just throw it in the wash. The brim gets soft. The crown shrinks. The hat is basically garbage.

You don’t have to choose between a dirty hat and a ruined one.

This guide shows you exactly how to wash a hat and keep its shape intact. No special sprays, no expensive kits. Just a simple process that works.

Let’s get into it.

Check your hat first

Before you wash your hat, you need to do a quick check.

If you skip this, you might ruin your hat before it even gets clean.

Check the brim first.

You need to know if it’s made of plastic or cardboard. Most modern hats are made of plastic, and they hold their shape well in water. But older hats and cheap gift shop caps often have cardboard brims.

If you soak a cardboard brim, it is finished. It turns into a soggy mess and never looks right again.

Not sure which one you have? Flick the brim with your finger. A plastic brim makes a sharp click, but a cardboard brim makes a dull thud. If it thuds, keep it away from water.

Next, check the fabric.

Cotton and polyester are usually fine. But wool shrinks fast in warm water, so you have to be careful with it. If you already cut the tag off and aren’t sure what your hat is made of, check our guide to common hat materials before you do anything else.

One more thing. If you have a straw hat, don’t get it wet at all. Water makes the straw swell and ruins the shape permanently.

Finally, test the dye.

Take a damp white microfiber cloth and rub it gently on a hidden spot inside the hat. If color transfers onto the cloth, the dye isn’t set, and soaking the hat will cause the colors to bleed.

If that happens, skip the full wash and spot clean only.

Best Ways to Wash a Hat Without Damaging It

We spent the last week testing these methods on everything from vintage wool caps to modern snapbacks.

Here is exactly what we learned, including the small mistakes that can ruin a good hat.

Method 1: Spot Cleaning (The Quick Fix)

Most people think they need to soak a hat the moment they see a stain. They don’t. In fact, if your hat has a cardboard brim, a full soak is a death sentence.

Pro Tip: If your hat looks clean but has a lingering smell, don’t risk the water. This is especially true for vintage hats and cardboard brims. Try deodorizing the hat using dry methods instead.

When we spot clean, we use a very specific “dry-foam” approach. We mix a tiny bit of dish soap in a bowl of water and whisk it until it’s foamy.

You only want the foam, not the water itself. This keeps the fabric from getting too wet.

Use a soft-bristle toothbrush to apply the foam directly to the stain. A toothbrush works better than a cloth because the bristles get deep into the fabric without fraying it.

Scrub in small circular motions, then dab the area with a dry paper towel. If the stain starts spreading, you’re using too much liquid. Stop, let it dry, and try again.

Be careful around the mesh panels and the top button. You don’t want water sitting inside the hardware.

Method 2: How to Hand Wash a Hat (The Safest Way)

This is the method we recommend for 90% of hats. It gives you the most control, and it’s the least likely to damage the brim or shrink the fabric.

Fill a sink with cool water and add just one teaspoon of mild detergent. Don’t use warm water, because it can cause colors to bleed.

Let the hat soak for about 30 minutes.

Around the 15-minute mark, give the sweatband some extra attention. This is where sweat, salt, and body oils build up the most.

Put a small amount of soap directly on a toothbrush and scrub the inside of the sweatband while the hat is still submerged.

If the stains are stubborn, add a small amount of OxiClean to the water instead of bleach. Bleach is too harsh and will damage the fabric and the stitching.

When you’re done soaking, don’t rinse the hat under a high-pressure faucet. The force can mess with the stitching. Instead, hold it under a gentle stream of cool water until all the soap is gone.

Pro Tip: If you have a white hat with yellow sweat rings that won’t come out, check our guide on removing sweat stains from white hats for the exact steps to get them bright again.

Method 3: Machine Washing (For Modern and Sturdy Hats)

Most people think putting a hat in the washing machine is a death sentence for the brim. And honestly, for a long time, we agreed.

But after testing it on modern polyester and cotton hats, we found a process that actually works. You just have to follow the steps carefully.

Use a Hat Cage or Laundry Bag

Before anything else, put the hat in a plastic hat cage or a mesh laundry bag. This is not optional.

We once washed a hat without protection, and the brim got caught in the rubber seal of the machine. It bent the brim and tore the stitching. Don’t skip this step.

Use the Right Settings

When you’re at the machine, keep it simple:

• Water Level: Low or Medium
• Temperature: Cold Only

Hot water softens the glue inside the brim, and once that glue goes soft, the hat loses its shape permanently.

Choose the Right Soap

You only need about a teaspoon of liquid detergent.

One teaspoon of liquid detergent is enough. Stay away from powder detergent because it leaves a white residue on the fabric.

Skip the bleach and fabric softener too. Both are too harsh for the stitching.

Set the Right Cycle

Use the “Delicate” or “Hand Wash” cycle with a low spin speed. A fast spin puts too much force on the brim and warps it.

Don’t Mix Heavy Fabrics

Never wash your hat with jeans, towels, or hoodies. These get heavy when wet and will crush the crown during the cycle. If you want to add other items, stick to light t-shirts only.

Dry it Properly

Take the hat out as soon as the cycle ends and reshape the crown with your hands while it’s still damp.

Then set it upside down on a towel or over a bowl and let it air dry for 24 hours. Never put it in the dryer. The heat and tumbling will ruin it.

Method 4: The Dishwasher Hack (Use With Caution)

The internet loves this method, and we get why. The hat sits in one place and doesn’t tumble around like it does in a washing machine.

But we found a few serious problems that nobody talks about.

The Soap Problem

Most dishwasher pods contain bleach and harsh chemicals designed to scrub food off plates. Those same chemicals will strip the color from your hat instantly.

Use one tablespoon of mild liquid laundry detergent instead and place it in the detergent compartment.

The Heated Dry Problem

This is the biggest one. We tested the heated dry setting on a hat, and the plastic brim warped so badly it was unwearable. Turn off the heated dry setting before you start the cycle. This is not optional.

If You’re Going to Try It, Follow These Rules

• Use a hat cage. Place the hat in a plastic hat cage before it goes anywhere near the machine. Without it, the water pressure will crush the crown flat.
• Top rack only. The bottom rack sits too close to the heating element and will melt the plastic parts of your hat.
• No dirty dishes. Don’t throw your dinner plates in with the hat. Food grease and sauce will soak into the fabric, and the smell won’t come out.
• Cold water, delicate cycle. Use the lightest setting your machine has and make sure the water is cold.
• Kill the heat. Manually turn it off before the cycle starts. This is the step most people forget, and it’s the one that ruins the hat.
• Get it out immediately. The second the cycle ends, grab the hat. Leaving it in that hot, steamy machine will shrink the fabric and bend the plastic brim.

Once it’s out, reshape the crown with your hands and let it air dry on a towel for 24 hours.

How to Dry Your Hat Without Losing Its Shape

This is where most people mess up. They do all the hard work of cleaning, then just leave the hat flat on a table to dry.

That’s a mistake.

When a hat is wet, it’s heavy. If you lay it flat, the weight of the water pulls the crown down. By the time it dries, the hat looks limp and shapeless.

Support the Crown

The most important thing is to give the crown something to hold its shape while it dries.

You don’t need a mannequin head. Just bunch up a dry hand towel and stuff it inside the hat until the crown looks exactly like it does when you’re wearing it.

A small soccer ball works too, but the towel gives you more control over the shape. If you don’t support the crown, the fabric will wrinkle as it dries, and it won’t go back.

Keep the Brim Flat

If you like your brim flat, set the hat on a flat surface and place a heavy book on just the brim. This stops the edges from curling up as it dries.

Stay Out of the Sun

Don’t put your hat outside to dry faster. We left a black hat on the porch for three hours, and the fabric came out looking dull and faded. The sun acts like bleach on wet fabric, especially dark colors.

Dry it inside on a counter with a fan nearby. That’s all you need.

No Hair Dryer

Don’t use a hair dryer to speed things up. The heat warps the plastic inside the brim, and once that plastic bends, it’s permanent.

Just be patient. It takes about 24 hours for the sweatband to dry completely. If you put the hat on while it’s still damp, it will stretch out, and the fit will be ruined.

Wait until it’s bone dry.

5 Common Mistakes That Will Kill Your Hat

These are the shortcuts that kill good hats. Avoid all five, and your hat will last for years.

How to Keep Your Hat Clean Longer

Washing a hat is a hassle. It takes time, and you can’t wear it for a full day while it dries. The real trick is keeping it clean so you don’t have to wash it as often.

Get a lint roller

Most hats don’t actually have dirt on them. They just have dust and hair. If you leave that dust there, you press it deeper into the fabric every time you touch it.

A quick pass with a lint roller after each wear keeps the hat looking fresh without any water involved.

Wipe the sweatband after every wear

This is the part that gets gross first. The oil from your skin is what ruins the fabric and turns it yellow.

When you get home, take a damp cloth and give the inside band a five-second wipe. It stops the sweat from drying and leaving those white salt lines.

Do this every day, and you might only need to wash your hat once a year.

Use a water-repellent spray

We tried a water-repellent spray on a hat before a long walk. The sweat didn’t soak in it all. It just sat on top and wiped right off. It’s an easy way to protect the fabric and keep the colors from fading.

Don’t put your hat away damp

Throwing a damp hat into a dark closet or bag is how hats start to smell. Leave it out on a counter for an hour to air out before putting it away.

For a full breakdown on protecting your hats, check out our essential hat care guide.

Common Hat Washing Questions

Over to You

Now you know exactly how to wash a hat without ruining the brim or losing its shape.

Now we want to hear from you. Which method are you going to try first? Hand washing or the washing machine?

Let us know in the comments below.