The answer to this question is a resounding "yes"! In fact, there are a few different ways to machine-wash a shower cap. You can either place the shower cap in the washer machine with your other laundry, or you can hand wash it in a sink or bathtub.If you choose to machine-wash your shower cap in the washer machine, make sure to use a mild detergent and cold water setting. Also, be sure to avoid using any type of bleach, as this can damage the fabric of the shower cap.If you choose to hand wash your shower cap, fill up a sink or bathtub with warm water and add a small amount of mild detergent. Gently swish the shower cap around in the suds for a minute or two, then rinse it thoroughly under warm running water. Hang it up to dry completely before using it again.