That would depend on what they are made out of. Some are washable. Put them in a pillow case and tie it so they don't get snagged on anything. Others can be sprinkled with baking soda, let sit, then brush it off. The plastic things, wash with a vinegar and water solution. If real dirty, sprinkle with baking soda, then splash vinegar on them and they will foam up, let em sit for maybe 10 minutes then rinse good.