I clean them out, put them in a bowl with hot water, a few drops of sunlight and add some hand sanitizer in there too and let it stand for half an hour (you can overnight too). Just watch out for resin tanks and driptips, dont use sanitizer on them, they will stain white. Rinse it all off with hot water again to make sure you get all the soap and sanitizer out and stack them out still hot to air dry.