I'm going to put some in the dishwasher right now and see how that goes. I never thought of that. I was going to put them in the bath tub with a splash of bleach. Mostly I scrub with antibacterial hand and face baby wipes a lil each day. It seems if there is no elbow greece involved, they still look shabby. When I taught preschool we used water and bleach solutions to clean everything.