Many people have a favorite ballcap, whether it shows off a sports superfandom, provides sun protection, or hides messy hair. But as you wear that hat, the fabric inevitably develops unsightly sweat stains. While you might think the washing machine is your best option, be careful — that appliance can easily damage the cap’s shape.…
A No-Sweat Solution
Creating a homemade cleaning paste is a much safer alternative to the washing machine. To make the solution, mix 1/2 cup of baking soda with 1 tablespoon of fine-grain table salt and 1 tablespoon of 3% hydrogen peroxide. Combine those ingredients in a small bowl, grab a soft-bristled brush (such as an old toothbrush or a laundry stain brush), and you’re ready to begin.
Before applying the mixture, dip your brush into the paste and test it on an inconspicuous part of the hat. This spot test is essential to ensure the solution won’t damage or discolor the fabric. Wait 20 to 30 minutes, or until the paste is completely dry, to check the results.
Once you know that the paste is fabric-safe, slather it on the inside of the hat, focusing on the sweatband and any other problem areas. Use your soft brush to scrub the paste into the fabric with small, circular motions. Let the paste sit for at least 20 minutes. The hydrogen peroxide acts as a color-safe bleach to remove stains, while the baking soda and salt work together to neutralize odors and scrub away oils.
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After 20 minutes, submerge the hat in cool water to rinse away the paste — assuming the material is durable enough. While this method works for sturdier modern hats, be cautious with vintage hats made before the 1980s. These may contain cardboard brims that will lose their shape if soaked. For older hats, carefully wipe the paste away with a damp towel instead.
Molded to Perfection
After removing the paste, let the hat air-dry. To maintain its shape, place the cap on a rounded object that resembles the shape of a human head, such as an upside-down bowl. This helps prevent the hat from flattening, ensuring it’s ready to wear once dry. If any stubborn sweat stains persist, repeat the process until the cap is clean enough for your liking.
