here are three major concerns when it comes to washing baseball caps. Warping the shape, wrecking the brim and shrinking your favorite cap. You will not have to be concerned anymore because we have a great solution for you. The cap washer can easily clean flat and curved caps. Simply slip your cap into the washer and pop it in the washing machine or even the dishwasher. You’ll be impressed with how often you will be able to wash your caps.