I let them soak for 5 - 10 minutes in cold soapy water (or when I remember.) Rub gently with your hands. Rinse in cold water. Stuff loosely with plastic bags. Actually those mesh veggie bags are best. Let dry on the lanai out of the sun in a breeze if possible. Some of the hats are stiff enough that they don't need stuffed while they dry.
No hot water. No sun.
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