I've toured quite a bit and never had a problem washing out my shorts. I only travel with 2 pair no matter how long the trip. I carry a small bottle of laundry detergent and always manage to find water somewhere to wash them out, then hang them off my panniers to dry while riding. Wear a pair and have a pair drying. I also carry those little personal towellettes to use if I need to. If you're camping remember to use environmentally friendly low sudsing detergent. But let's face it, after awhile, you're gonna stink. The good thing is everyone with you will stink and you won't notice yourself!
