I don't wash mine very often. It doesn't get stinky, really, but I do the "wait, how many times have I worn this? When did I last wash it?" thing. In between wearings, I put it flat on a drying rack. When it is time to wash them, I either wash it by hand (cool to lukewarm water, whatever I wash my hand-knit wool in) with a dab of my shampoo (-cone free), or it goes in the washing machine on cold, gentle. It gets laid flat to dry. (I hand-wash most of the time because the apartment washers are all top-load, which are rougher on clothes. If I'm visiting my parents, I use their front-loader. )