The thing very few people realize is that you don't really get notably dirty or smelly underneath your clothes (exception being certain odor where the sun doesn

The thing very few people realize is that you don't really get notably dirty or smelly underneath your clothes (exception being certain odor where the sun doesn't shine). If you work up a sweat for a long time, it's a different issue in terms of smell, but there's really not any dirt underneath the clothes to talk about other than epithelieals - which is nothing that water alone can't handle. I don't use soap when showering and I smell just fine, but I do use shampoo for my hair, and deodorant under the arms.