Hats should pay attention to maintenance and custody. After take off the hat, don't lightly put, should hang on the coat rack, or hook, which do not lead to avoid aliasing distortion. Hats worn long, hat inside and outside coated with grease, dirt, wash away in a timely manner. Cap lining can be removed washed, then stretched on, lest Hat liner sweat stain on damp, moldy affect Hat life. Hat gray often brush. Attached to the CAP surface sludge, grease, use a soft brush dipped in hot soapy water and gently scrub, and then washed with water. Scrub hat, can find a hat of the same size pot or ceramic pots, wash hat on top, so as to avoid aliasing.