My pink Phillies ball cap was looking very grungy, but washing it by hand did not do the trick. Someone mentioned to me that there were such things as ball cap washers that allowed you to wash your cap in the dishwasher, and I searched for one on Amazon. This one was so reasonably priced and arrived in only a couple of days. It is designed to be used either in a washing machine or a dishwasher, but is not recommended for use in front-loader washing machines (which we have.) So in went the Phillies cap with the next load of dishes, and amazingly, it came out looking almost new.Ball Cap Washer - Safely Clean Your Cap In The Washing Machine or Dishwasher (White) (12"H x 8.5"W x 4.5"D)What a nifty little plastic contraption!