To wash a hat, remove external dirt, test the dye for color fastness, and pretreat any stains. Wet the hat, scrub it clean with a nail brush and shampoo or mild detergent, and rinse it completely. Ball up a towel inside the hat to preserve the shape as it dries.
- Remove dust from the hat
Use the vacuum brush attachment on your vacuum to remove external dust and dirt.
- Test for color fastness
Before washing a hat, test the dye for color fastness. Apply soap and water to a small, unobtrusive part of the cap, such as the inside. Make sure the dye doesn't bleed. If so, do not attempt to wash the hat.
- Treat very dirty areas
Dilute a cap of heavy duty detergent with water. Use a cloth to apply this solution to areas that are very dirty, especially the sweatband. Rub gently to remove any stains.
- Wet the hat
Fill the sink with lukewarm water, and wet the hat. Avoid soaking the bill, as this may cause it to lose its shape.
- Scrub the hat
Pour a small amount of shampoo or gentle detergent onto a nail brush, and scrub the hat, concentrating on areas that show visible dirt.
- Rinse the hat
Hold the hat under a flow of cool water, and rinse until the water is clear of soap. Continue keeping the bill as dry as possible.
- Air dry the hat
Ball up a towel, and push this into the hat so it keeps its shape. Place the hat aside to dry completely before wearing.