To wash a baseball cap in the dishwasher, secure it in a cap frame (or shape it over an upside-down bowl), place it on the top rack away from the spray arm, and run a normal cycle with a mild, bleach-free detergent and the heated dry cycle turned off. Then air dry it on a cap form or bowl to hold its shape. One important caveat: only do this with a cap that has a plastic brim — older or vintage caps often have a cardboard brim that will fall apart when wet, so check the care label first and hand wash those instead.
Your favorite baseball cap, worn with pride but dulled by a season of sun, sweat, and dirt, can be restored with the right cleaning routine. The dishwasher is a surprisingly effective way to do it — here’s how to get a fresh, clean cap without warping it.
Choosing a dishwasher-safe detergent
The detergent matters as much as the method. Harsh chemicals strip color and weaken fabric fibers, so choose a gentle, pH-neutral detergent free of bleach, dyes, and fragrances. Plant-based dishwasher detergents tend to be less abrasive and keep colors intact.
Skip fabric softeners, which leave a residue that attracts dirt. As for form:
- Dishwasher pods: pre-measured and convenient, reducing the risk of using too much detergent and leaving residue.
- Liquid detergents: easier to rinse out and offer more control over the amount, but measure carefully to avoid overuse.
How do you keep a cap’s shape during the wash?
A cap holder gives the cap a secure fit during the cycle and helps it keep its original shape. Placing it in loose, without support, risks warping it.
DIY cap holders
No specialized holder? Improvise with household items — a sturdy curved bowl, an upside-down coffee canister, or a cradle bent from craft wire. The goal is to mimic the cap’s natural curvature so it holds its form through the wash.
Commercial cap frames
For a more reliable hold, a dedicated cap frame works best:
- Buy a cap frame designed to hold caps during washing.
- Insert the cap so it’s firmly nestled and holds its shape.
- Secure the frame in the dishwasher so it can’t move and cause deformity.
How should you place the cap in the dishwasher?
Where you put the cap in the dishwasher has a big impact on the result.
Use the top rack
The top rack is the gentlest zone — farthest from the heating element and the most intense water pressure — so it’s the safest spot for your cap’s fabric. Fasten the cap snugly so it doesn’t shift, and align it to avoid direct hits from the spray arm. Choose a mild detergent, and check the care label first: heed any ‘hand-wash only’ warning, since this method isn’t suitable for every cap.
Avoid heat damage
Drying is the riskiest phase. High heat can warp the cap, misshape the brim, and damage the fabric, so always turn off the heated drying cycle and let the cap air dry on a cap form or an upside-down bowl instead. Keeping heat out of the entire process is what protects the cap’s shape and finish.
Post-wash care
Air drying
Give the cap the right environment to dry. Keep it out of direct sunlight and away from intense heat sources like radiators or vents, which can fade or degrade the material. A cool, well-ventilated spot with steady airflow is ideal. Rest the cap on a clean, dry towel that won’t transfer color or lint.
Maintaining shape
Handle the cap gently to avoid distortion. As soon as it’s out of the dishwasher, shape the bill and crown with your hands while the cap is still pliable for a natural fit once dry. A cap shaper — or a large coffee can or bowl supporting the interior — prevents shrinking and misshaping. Once it’s fully dry, check for any remaining dampness before storing to avoid mold or mildew.
Key points
- Use a mild detergent or dish soap.
- Place the cap in a cap cage or mesh laundry bag to protect its shape.
- Avoid hot water and high-heat settings, including the heated dry cycle.
- Wash the cap separately from dishes.
- Check the care label first — and confirm the brim is plastic, not cardboard, before washing.
FAQ
What products should I use to wash a baseball cap in the dishwasher?
Use a mild detergent or dish soap, and avoid bleach or harsh chemicals that can damage the cap.
How do I keep my cap from losing its shape?
Place it in a cap cage or mesh laundry bag, or secure it in a cap frame, to help it hold its form during the cycle.
What should I avoid when washing a cap in the dishwasher?
Avoid hot water and high-heat settings, and skip the dishwasher’s heated drying cycle — heat can shrink or warp the cap.
Can I wash my cap with other dishes?
No — wash the cap separately to avoid food contamination and potential damage.
How often should I wash my cap this way?
It depends on how often you wear it and how dirty it gets, but every few weeks or whenever it looks visibly soiled is a good rule of thumb.
Is the dishwasher safe for every cap?
No. It’s only safe for caps with a plastic brim. Many older and vintage caps have a cardboard brim that disintegrates when wet — hand wash those, and always check the care label if you’re unsure.
