I'm with you Bird. Dirty bathwater is like sitting in people soup. I take showers to get clean, baths to relax and soothe achy muscles.
I'm a bit of a germphobe, so I use anti-bacterial Dawn dishwashing liquid to wash my body. It gets me clean without drying my skin out. If I'm out of that, I use old fashioned Gold Dial anti-bacterial bar soap.
My hair is very curly and dry, so I only wash it twice a week. The other 5 days I rinse it thoroughly, and use conditioner, working it through my hair like shampoo. I let it sit for a minute, then rinse well. It cleans and refreshes my hair and scalp without drying and frizzing my curly locks. Oh, and I use Suave too, the one that's like Nexxus Humectress.