Fill the pool with water and add detergent. The water should be hot, but be careful not to burn yourself. Add15ml detergent to water. The detergent used should not be aromatic or contain any dyes, otherwise it will damage the hat. Stir well by hand. You can also wash it in the bucket, not in the pool. Dip the baseball cap into the pool. Brush the place with the most dirt with a toothbrush, but brush lightly where there are trademarks or signs. Rinse the hat with cold water. Drain the water in the pool, then turn on the tap to make sure the water is cold, then rinse the hat below and rub it with your fingers from time to time until all the detergent is washed away. Let the hat dry. Put some clean rags inside the hat to help it shape, otherwise the hat will easily deform and you won't be able to wear it. If you want the hat to dry faster, you can turn on the electric fan and blow it over. But never use hot feng shui, or the hat will shrink.
Pay attention to the maintenance and storage of hats. Don't put your hat anywhere after you take it off. It should be hung on the coat rack or clothes hook. Don't press heavy objects on it to avoid deformation. If the hat is worn for a long time, it will be stained with oil and dirt inside and outside, so it should be washed off in time. The hat liner can be removed and cleaned before stretching, so as to avoid the sweat and mildew on the hat liner from affecting the life of the hat. Brush the dust off your hat often. You can gently brush off the sludge and grease attached to the surface of the bottle cap with a soft brush dipped in hot soapy water, and then rinse it with clean water. When washing the hat, you can find a round jar or porcelain basin the same size as the hat, put the hat on it and wash it again to avoid deformation.