Once you let the hat sit, remove it and rinse it under warm, clean.

Best way to get sweat stains out of hats. Stir to mix in the detergent. Use a combination of hydrogen peroxide and water. Fill a sink with hot water, then add the borax, laundry detergent and washing soda (basically, we’re applying laundry stripping to your hats).

Dip an old toothbrush in the solution and apply it directly to the sweat stains. Grab a clean toothbrush and dip it into the mixture and scrub off the remaining sweat stains. Try not to use a detergent with bleach or a bleach.

Try not to use a detergent with bleach or a bleach. Scrub it really well for a few. Wipe away sweat stains with a cloth like a microfiber cloth, damped with water and a little dish soap.

Rinse until all of the soap is gone, slightly squeezing the hat to get excess moisture. 1.1) to remove sweat stains from hats, one option is to use baking soda. Also, concentrate on areas that soak up a lot of sweat.

Stir the water occasionally to help rid the fabric of stains. White vinegar is also great for spot treatment. Spray a stain treatment product like shampoo to loosen sweat and grime.

Finally, rinse off your hat with cool water. Submerge the hats in the water, then. To get sweat stains out of hats, put some baking soda on the stain and leave for about an hour.