How to Wash Hats in the Dishwasher (And Why You Probably Should Not)
How to wash hats in the dishwasher is an old trick that has circulated for decades, and it has a kernel of truth in it. A dishwasher holds a hat in a fixed position rather than tumbling it, which is better than a washing machine.
Everything else about it is a problem. Speedy Pros Hats is a family-run hat shop in Tampa Bay, and dishwasher damage is one of the more common reasons a hat gets replaced early.
- Heat is the whole problem. Dishwashers run hot by design and the element sits below the rack.
- Detergent is engineered for grease on ceramic. It is harsh on dyed fabric.
- Hand washing takes ten minutes. And carries none of the risk.
How to Wash Hats in the Dishwasher: The Short Answer
If you are going to do it, use the top rack only, no detergent or a small amount of mild soap, no heated dry cycle, and only on a structured cotton cap with a plastic brim insert. Never put a foam-front trucker, a fitted cap, a wool blend, or a knit beanie through a dishwasher. Hand washing is safer and barely slower.
Where the Method Came From
The logic was sound when it appeared. A washing machine agitates, which crushes crowns and warps brims. A dishwasher holds the hat still on a rack. If the only two options were those, the dishwasher would win.
But that framing skips the actual best option, which is a sink and ten minutes. The dishwasher method survives because it feels like a clever hack rather than because it produces better results.
What Actually Goes Wrong
| Factor | What it does | Which hats it ruins |
|---|---|---|
| Heat (wash cycle) | Softens brim adhesive and buckram | Structured caps, fitted caps |
| Heat (dry cycle) | Shrinks cotton unevenly, warps inserts | Every hat, without exception |
| Dishwasher detergent | Highly alkaline, engineered for grease | Dyed fabric, colored stitching |
| Steam and prolonged damp | Delaminates foam, separates layers | Foam-front truckers |
| Food residue in the machine | Redeposits onto fabric | Light-colored hats especially |
The rack position solves one problem and the machine introduces four more.
In short. A dishwasher fixes the agitation problem and replaces it with a heat problem, which is worse.
Running the hat through a normal cycle with regular dishwasher detergent. That detergent is formulated to strip baked-on grease from ceramic and it is severe on dyed cotton.
Which Hats Absolutely Cannot Go In
- Foam-front trucker hats. Heat and prolonged steam delaminate the foam behind the panel, and the crease is permanent.
- Fitted and stretch-fit caps. Heat destroys the elastic in the band, and a stretched-out fitted cap has no adjuster to compensate.
- Wool and wool-blend caps. Wool felts with heat and agitation, shrinking irreversibly.
- Knit beanies. The knit stretches while wet and the heat sets it that way.
- Anything with a leather or leather-look patch. Heat and soaking will curl and discolour it.
The Ten-Minute Alternative
- Fill a sink with cold water. And a small amount of mild liquid soap.
- Spot-treat the sweatband. With a soft toothbrush. This is where discolouration accumulates.
- Clean the front panel with a damp cloth. Rather than submerging it, particularly on a foam-front blank.
- Rinse until the water runs clear. Residue dries visible on dark colors.
- Air dry over something round. That holds the crown open. No heat, no direct sun.
That sequence handles everything a dishwasher would and carries none of the risk. The longer version covers stubborn cases.
Performance and moisture-wicking blanks release dirt faster than heavy cotton twill because the weave is engineered to shed moisture. They also dry faster, which matters more in Florida humidity than most people expect.
What About the Embroidery?
Polyester embroidery thread is colorfast and survives cold hand washing indefinitely. It is not the vulnerable part of the hat, and a well-decorated cap keeps its logo long after the structure has softened.
What dishwasher heat can affect is the backing behind the design, which may pucker if the panel is thoroughly soaked and then dried at temperature. That is a structural failure around the embroidery rather than a failure of the stitching itself, and it is not repairable.
If a hat has already been through a dishwasher and the brim is warped, reshaping will not hold. The insert has taken a new set and it stays there.
Cleaning a Hat With a Patch
A leather-look patch is the part of the hat least tolerant of water, and it dictates the method whenever one is present. Keep the patch dry, clean around it with a barely damp cloth, and never soak the front panel.
Woven and embroidered patches are more forgiving, since they are textile rather than a leather substitute, but the stitching around the edge still traps detergent. Rinse the perimeter more thoroughly than the rest.
Heat is the shared enemy again. A pressed patch will begin lifting at the corners after any warm cycle, and a sewn one will survive the water and still be attached to a hat whose shape has gone.
Prevention Beats Both Methods
A thirty-second cold rinse of the sweatband after heavy use stops salt accumulating, which is what causes most of the staining people are trying to remove later. Rotating between two hats gives each one time to dry fully, which matters more than any cleaning method.
For crews working outdoors, that is the practical case for ordering spares in the original run rather than replacing hats individually as they wear out.
If a hat is past saving, demote it to a work hat rather than trying to rescue it. Aggressive cleaning on a damaged cap rarely improves it and usually finishes it off.
Odour Rather Than Staining
Sometimes the problem is not visible at all. A hat that smells has bacteria in the sweatband, and cleaning the outside does nothing for it.
The treatment is the same cold hand wash with attention concentrated on the band itself, followed by drying completely rather than mostly. A band that stays slightly damp reintroduces the problem within days, which is why rotating between two hats solves odour more reliably than any cleaning method.
Diluted white vinegar handles bacteria as well as salt, which makes it the useful first step in either case. Rinse it out thoroughly or the hat will smell of vinegar instead.
Hats That Should Never Be Washed at All
Vintage and wool-blend caps are usually better spot-cleaned than washed. Wool felts with agitation and moisture, and old brim inserts can be cardboard rather than plastic, which disintegrates completely.
If a brim feels soft or flexes unevenly, assume cardboard and keep it dry. Spot-clean the fabric with a barely damp cloth and accept that the hat will not come back to new. That is preferable to it coming back in pieces.
Getting Custom Hats Right the First Time
Cleaning is downstream of the blank and the decoration. A quality blank with well-digitized embroidery stays presentable through years of cold hand washing. A cheap blank with a printed logo will not survive one Florida summer regardless of method.
Speedy Pros Hats sends a free digital proof before anything is stitched. Family-owned since 2009, no minimum order, and free artwork setup on orders of 12 or more.
Drying Properly
Drying causes more damage than washing does, and it is the step people rush. A hat needs to dry over a form that holds the crown open, in moving air, out of direct sun.
Florida sun is a specific hazard here. It dries a hat quickly and fades dyed fabric while doing it, and on a dark blank the fading is uneven because the crown gets more exposure than the panels beneath the brim. Shade with airflow beats sun every time.
A hat that takes a full day to dry is drying correctly. If it is dry in an hour, something is applying heat it should not be.
More recent guides: how to wash a fitted hat, how to wash a baseball cap.
Frequently Asked Questions
Can you wash a hat in the dishwasher?
A structured cotton cap with a plastic brim may survive a top-rack cycle with no heated dry. Most other hats will not, and the risk outweighs the convenience.
What temperature ruins a hat?
Anything above warm. Dishwasher wash cycles and heated dry cycles both exceed it comfortably.
Can I use dishwasher detergent on a hat?
No. It is highly alkaline and formulated to strip grease from ceramic, which is severe on dyed fabric and colored thread.
Will the dishwasher shrink my hat?
The heated dry cycle will, unevenly, because the panels and the brim insert respond differently to heat.
Is a washing machine better than a dishwasher?
Neither is good. A machine agitates and a dishwasher heats. A sink of cold water avoids both problems.
How do I clean a hat with a leather patch?
By hand, cold, keeping water off the patch itself. Heat and soaking will curl and discolour leather-look material.
Related Reading
- How to Clean a Hat
- How to Wash a Trucker Hat
- Custom Hat Buyer's Guide
- Bulk Custom Hats
- Custom Hats With No Minimum
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