Although our 22 momme pillowcase is an extremely durable material when it comes to silk, you still need to be gentle when washing and maintaining Hydroluna. When caring for your pillowcase, wash on a light cycle using a gentle, pH neutral detergent and cold water-we recommend using a gentle silk detergent. It is important to air dry your pillowcases as opposed to machine drying. DO NOT dry clean or use bleach on your Hydroluna pillowcase. Avoid any oil based cleaners/sprays that will degrade the silk materal.