In the washer with a VirKon tablet. I put a blanket or a couple sheets in with them so they don't knock around in there too much. VirKon kills all kinds of bugs, bacteria, molds and such. It is used to clean out barns, cages, and stalls and anything to do with animals where you need to steralize or just clean well. Once it dries it is non toxic to animals. I have used it to clean out horse stalls, rabbit cages, chicken barns, all kinds of things.