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How to wash a baseball cap 
Assess your hat. 
First you will need to look closely at your baseball cap to determine if it can be washed and the best approach. 
Examine the cap to see if it is well made and if it will hold up to a washing.
Look carefully at the material, stitches, and the brim. If your hat is made with good quality materials, is relatively new, and has solid stitching you should be able to wash it without trouble.