It depends where I camp. If there are showers, I'll wash my bike shorts and socks while I shower. If there's a river, I wash the clothes in the river using no soap. Rubbing the clothes on rocks works well. If there's only a spigot, I can use a ziploc or large plastic bag to do one wash cycle and one rinse cycle. If there's no water source, then I don't wash. However I don't mind being slightly dirtier than if I were home. The benefit of this attitude is that you don't need to carry a ton of extra clothes.