Fill a sink or bucket with cool or warm water.

Sweat stains out of hats. Soak your hat in a cleaning solution of vinegar and water overnight. Give the hat time to soak, as many as 4 hours may be needed. Try not to use a detergent with bleach or a bleach.

Get a dish tub or a wash bucket. Do something else for an hour or so. Always wash with same colored clothes if you’re doing your laundry in the machine, make sure your black hats are.

Stir the water occasionally to help rid the fabric of stains. 1.1) to remove sweat stains from hats, one option is to use baking soda. First, you can spray some stain remover.

When there are no more visible. Use a combination of hydrogen peroxide and water. Try not to use a detergent with bleach or a bleach.

Finally, rinse off your hat with cool water. Self adhesive cloth tape makes it easy to stick on. Spray a stain treatment product like shampoo to loosen sweat and grime.

Grab a clean toothbrush and dip it into the mixture and scrub off the remaining sweat stains. Once you let the hat sit, remove it and rinse it under warm, clean. Put a few drops of dish soap in.