Yes, you can wash your designer cushions, no problem at all. 3Beaches fabrics are made in Sunbrella so simply follow the machine washing instructions. Details can be found here (link) https://global.sunbrella.com/en-us/how-to-clean. In regards to Mokum, James Dunlop and Catherine Martin, they recommend a warm wash, do not dry clean, tumble dry and DO NOT directly iron these covers once clean (use a barrier cloth) as some fabrics will melt under intense heat as they are olefin based.