Be sure to clean up all the baking soda.

Sweat stains out of hats. Try not to use a detergent with bleach or a bleach. Once you let the hat sit, remove it and rinse it under warm, clean. Stir to mix in the detergent.

Try not to use a detergent with bleach or a bleach. Dip your hat into the soapy water, and let it sit for three to five hours. Apply diluted vinegar directly on the stain.

Put a few drops of dish soap in. 1.1) to remove sweat stains from hats, one option is to use baking soda. White vinegar is also great for spot treatment.

Grab a clean toothbrush and dip it into the mixture and scrub off the remaining sweat stains. Swish hat around for a minute in the water. Do something else for an hour or so.

Wait at least an hour to let the powder soak up the sweat stain. After removing the hat, rinse it thoroughly under running clean water until the water is clear and there. Soak your hat in a cleaning solution of vinegar and water overnight.

Self adhesive cloth tape makes it easy to stick on. Wipe away sweat stains with a cloth like a microfiber cloth, damped with water and a little dish soap. Not only against sweat stains to keep your hat clean and have a long life but also can adjust your hat size.