Many everyday, casual caps are made from a fabric called cotton twill. The medium weight, wrinkle-resistance and durability of cotton twill makes it an ideal fabric for baseball caps, visors, fedoras and bucket hats. Like any cotton fabric, a twill blend requires regular washing to remove the dirt, and especially the sweat, that accumulate from wear. Most modern twill hats are machine washable; however, some older styles will require hand-washing to prevent damage. When available, always follow the hat's care instructions on how to best launder your hat.
Ensure the hat does not have any cardboard in it, such as the cardboard you'd find in the bill of an older baseball cap. If your cap has hardboard in it, you should not wash it in a machine as water will ruin the cardboard portion. If your hat is made after 1982, you should be good to go.
Spray a pre-treatment stain remover on any stains. Let the stain remover sit for 10 minutes, or per the product's instructions.
Wash the hat in cold water and with a mild detergent in your washing machine. If you are worried about a baseball cap losing its shape, consider buying a hat form that helps the shape stay intact. You can wash the hat by itself or with a small load of similar colors.
Air-dry the hat. Using a clothes dryer may shrink the hat.
Washing By Hand
Place your hat over a towel to clean by hand.
Test the hat to ensure the color doesn't bleed. Mix a mild detergent with water, per the detergent's instructions. Dip a clean cloth into the mixture and apply the cloth to a discreet spot on the hat, such as the underside. Proceed to clean the hat only if the color doesn't bleed in the test spot.
Wet the cloth with the detergent and water mixture. Dab the hat with the cloth. Do not wet the cardboard bill in a baseball cap.
Brush in the cleaning solution with a toothbrush. Gently rub the toothbrush in small circles all over the hat, excluding the cardboard bill.
Dip a clean cloth in cool water. Thoroughly ring out the cloth. Wipe the hat with the cloth to remove the soap.
Rinse the cloth in cool water and then continue wiping down the hat until the soap residue is gone. Let the hat air-dry.
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