The safest way to wash a hat is to hand wash it in cool water with a few drops of mild detergent, scrub stains gently with a soft-bristle brush, rinse well and air dry it on a rounded form so the crown keeps its shape. That method works for most cotton and polyester baseball caps, trucker hats and dad hats. Hats follow the same basic rules as the rest of your laundry, so if you already know how to wash clothes gently, you are halfway there.
Quick answer
Quick answer: Hand wash in cool water with mild detergent, scrub the sweatband with a soft brush, rinse thoroughly and air dry on a bowl, ball or towel roll. Never use the dryer.
- Check the label, material and brim before choosing a method; cardboard brims should never be soaked.
- Hand washing is the safest method for almost every cap, especially older or vintage ones.
- Washing machines and dishwashers can work for newer caps with plastic brims, on cool settings only.
- Pre-treat sweat, makeup and sunscreen stains on the sweatband with a baking soda or oxygen bleach paste.
- Wool, straw and structured fashion hats need spot cleaning, not soaking.
How to Wash a Hat: The Quick Answer
To wash a hat, fill a sink with cool water and a teaspoon of mild detergent, pre-treat the sweatband, soak the hat for 15 to 30 minutes, scrub with a soft brush, rinse until the water runs clear, then press out water with a towel and air dry it on a rounded form away from heat.
Here is how the main methods compare by hat type and risk:
| Method | Best for | Risk level | Avoid for |
|---|---|---|---|
| Hand wash | Cotton, polyester and trucker caps, most dad hats | Low | Cardboard brims, wool felt, straw |
| Washing machine | Newer polyester or cotton caps with plastic brims | Medium | Vintage caps, structured crowns, leather straps |
| Dishwasher (top rack) | Sturdy, colorfast caps with plastic brims | Medium to high | Anything wool, cardboard brims, caps with heavy embroidery |
| Spot clean only | Wool fedoras, straw sun hats, cardboard brims, vintage finds | Very low | Heavy all-over grime |
Before You Wash: Check the Label, Material and Brim
Before you wash a hat, read the care label, identify the fabric and figure out what the brim is made of. Cotton twill, polyester and acrylic usually handle water well; wool, straw and leather do not. A brim with a cardboard insert can warp or disintegrate when soaked, so it changes which method is safe. For styling ideas, see our guide to western outfits for women.
No label? Most modern caps are cotton twill or polyester, beanies are acrylic or wool, fedoras are wool felt and sun hats are straw or raffia. Each one also suits different types of fashion styles, from sporty caps to bohemian straw hats.
Cardboard vs. Plastic Brims
Many vintage caps have cardboard inside the brim, and some inexpensive new caps still do. To check, tap the brim: plastic sounds hollow and feels springy, while cardboard feels dull and slightly soft. If it crinkles or creases when flexed, spot clean only.
How to Spot Test for Colorfastness
Press a cotton swab dipped in your soapy water on a hidden spot inside the sweatband for 30 seconds. If dye transfers, wash quickly in cold water with no soaking.
How to Wash a Baseball Cap by Hand (Step-by-Step)
Hand washing is the best way to wash a baseball cap because you control the water temperature, the pressure and the time the hat stays wet. The whole process takes about 15 minutes of work plus a soak and a day of drying, and it is safe for nearly every cotton or polyester cap with a plastic brim.
What You Need
A clean sink, mild detergent or gentle dish soap, a soft-bristle brush or toothbrush, baking soda or oxygen bleach, a towel and a rounded drying form such as a bowl, ball or rolled towel.
Steps 1–6
- Fill the sink with cool water. Add about one teaspoon of mild detergent and swish until it dissolves.
- Pre-treat stains. Dab a baking soda paste or detergent on the sweatband and marks; wait 10 minutes.
- Soak the hat. Submerge the cap for 15 to 30 minutes.
- Scrub gently. Use the soft brush in small circles on the sweatband, crown panels and underside of the brim. Go easy around embroidery.
- Rinse thoroughly. Run cool water through the hat until no suds remain.
- Reshape and blot. Press out water with a towel, reshape the crown and set it on a rounded form.
Stylist’s tip
Keep the whole hat moving in the water rather than scrubbing one spot hard. Even pressure across the panels helps prevent a “clean patch” that looks brighter than the rest of the crown.
How to Wash a Hat in the Washing Machine
You can wash a hat in the washing machine if it is a newer cotton or polyester cap with a plastic brim. Place it in a plastic hat cage or mesh laundry bag, choose the cold, gentle or delicate cycle, use a small amount of mild detergent and skip the spin if your machine allows it.
Wash with light items like T-shirts, never jeans or towels that crush the crown. Skip the machine for vintage caps, cardboard brims, wool or structured hats, leather straps and sequins, and avoid top loaders with a center agitator.
Can You Wash a Hat in the Dishwasher?
Yes, you can wash a sturdy cap in the dishwasher, but it is riskier than hand washing. Use the top rack only, a hat frame if you have one, a gentle detergent without bleach, a cool or normal cycle and no heated dry. Run it empty, without dishes, so food residue does not end up on the hat.
The risks are heat, which can shrink cotton or warp a brim, and pods with bleach or enzymes that fade color. If your dishwasher runs hot, use the sink. Never put wool, cardboard-brim or vintage hats in it.
How to Get Sweat Stains and Makeup Out of a Hat
To get sweat stains out of a hat, apply a paste of baking soda and water or oxygen bleach and water to the sweatband, let it sit for 15 to 30 minutes, scrub with a soft brush and rinse. Makeup and sunscreen need a degreasing step first, using a drop of dish soap or micellar water.
Sweat rings from salt and body oil set over time, so treat them early. A 50/50 white vinegar and water mix loosens salt lines before washing.
Cleaning a White Hat
Soak a white cotton cap in cool water with oxygen bleach for up to an hour, then scrub and rinse. Avoid chlorine bleach, which can yellow polyester and weaken stitching.
Removing Foundation From the Sweatband
Foundation, concealer, tinted sunscreen and SPF moisturizers leave tan or orange marks along the front of the sweatband. Because they are oil-based, detergent alone often misses them. Dab a drop of gentle dish soap or micellar water onto the mark, work it in with a toothbrush, wait five minutes, then wash as usual.
How to Clean a Hat Without Washing It
To clean a hat without washing it, spot clean marks with a damp cloth and a drop of mild detergent, remove dust with a lint roller or soft brush, and freshen the inside with steam or a fabric-safe disinfectant spray. This approach is ideal for cardboard brims, wool, straw and vintage hats.
Spot Cleaning and Sanitizing
Blot stains from the outside in with a well-wrung cloth dipped in cool, lightly soapy water, then a clean damp cloth. To sanitize a hat, especially a thrift-store find, mist the inside with a fabric-safe disinfectant spray or hold a handheld steamer a few inches away, then let it air out in a ventilated spot for several hours.
Cleaning Wool, Straw and Vintage Hats
Brush wool fedoras and felt hats counterclockwise with a soft hat brush, then spot clean with a barely damp cloth. Wool shrinks and felts with water and agitation, the same reason how to wash a wool sweater comes down to cool water and no rubbing. Straw sun hats need a dry brush and a lightly damp cloth only; soaking can unravel the weave. For silk linings or ribbon bands, the rules for how to wash silk (cool water, minimal handling) apply to those trims. Most knit beanies, by contrast, can be hand washed and dried flat.
How to Dry a Hat So It Keeps Its Shape
Dry a hat by pressing out excess water with a towel, then placing it on a rounded form such as a bowl, a ball, a coffee can or a rolled towel so the crown dries in its natural shape. Keep it out of direct sun and away from heaters. Expect 12 to 24 hours, depending on fabric and humidity.
Never put a hat in the dryer. Heat can shrink cotton, warp the brim and weaken the glue that holds structured crowns together. A fan on a cool setting speeds drying safely.
Do
- Use cool water and mild detergent.
- Spot test dark or bright hats before soaking.
- Dry on a rounded form so the crown keeps its shape.
- Treat makeup and sunscreen with a degreasing step first.
Don’t
- Soak a hat with a cardboard brim.
- Use chlorine bleach on colored or polyester caps.
- Put a hat in the dryer or near direct heat.
- Wash caps with jeans or towels that crush the crown.
How to Keep Your Hat Clean Longer
Keep a hat clean longer by spot cleaning the sweatband every few wears, letting it air out after each use, keeping makeup off the front band and storing it on a hook or shelf rather than crushed in a bag. Small habits mean you will need a full wash only a few times a season.
- Let your hat dry out after workouts before putting it away.
- Let foundation and sunscreen set for a few minutes before putting your hat on.
- Lint roll dark caps and felt hats before wearing.
- Store structured hats in a box with tissue in the crown, and stuff the crown with socks when you travel.
Stylist’s tip
A thin, removable sweatband liner or a strip of medical tape along the inside band catches sweat and makeup before it reaches the fabric. Replace it as needed and your cap will need far fewer deep washes.
Frequently asked questions
How do you wash a cap without ruining it?
Hand wash it in cool water with a teaspoon of mild detergent, scrub gently with a soft brush and rinse until the water runs clear. Avoid hot water, chlorine bleach and the dryer. Press out water with a towel and air dry the cap on a rounded form, like a bowl or ball, so the crown keeps its shape.
Can I use Dawn dish soap to clean my hat?
Yes. A few drops of mild dish soap like Dawn cut through sweat, body oil and makeup on the sweatband. Dilute it in cool water rather than applying it straight, spot test dark caps first, and rinse thoroughly, because leftover soap can stiffen fabric and attract new dirt over time.
How do you wash a sweaty hat?
Pre-treat the sweatband with a paste of baking soda or oxygen bleach and water, let it sit for 15 to 30 minutes, then soak the hat in cool soapy water. Scrub the band with a soft brush, rinse well and air dry. For lingering odor, add a splash of white vinegar to the rinse.
How do you sanitize a hat without washing it?
Spot clean visible marks, then mist the inside with a fabric-safe disinfectant spray or pass a handheld steamer over it from a few inches away. Let the hat air out in a well-ventilated spot for several hours. This works well for wool, straw, cardboard-brim and thrift-store hats that should not be soaked.
Can you put a hat in the dryer?
No. Dryer heat can shrink cotton, warp the brim and break down the glue in structured crowns, and tumbling crushes the shape. Always air dry a hat on a rounded form away from heaters and direct sun. A fan on a cool setting speeds drying safely if you need the hat sooner.
Can you wash a hat with a cardboard brim?
You should not soak a hat with a cardboard brim, because water softens the cardboard and can warp or break the brim permanently. Spot clean instead with a damp cloth and a drop of mild detergent, keeping the brim as dry as possible, then let the hat air dry on a rounded form.
