Hallo my name is Kate I have been teaching the art of weaving with whole fleece and peg looms for the past sixteen years. During that time I have never washed the fleece because I find it easier to work unwashed fleece. I make sure the dirtiest parts are removed first. The fleece stays together much better for this method of weaving, unwashed.Sometimes people prefer to wash the finished rug or mat after completion,this may take a while to dry, but it is worth it. I have a few rugs in my home, I have never washed them,they last well do not smell and I have not found any moths or other insects.