There was an interesting discussion on The Wright Stuff this week about how often people bathe or shower. Apparently (don't ask me for the statistics) every time we do either we remove helpful bacteria from our skin and washing your hair too often strips it of natural oils. In England, it also accounts for one fifth of water usage.
I must admit I do enjoy a good soak in the bath, but I don't use any products, just water, except for shampoo once a week.
My mother had a bathroom, but used to have what she called 'a good stand-up wash' most days, and a bath about twice a week. She always smelled good and her hair was thick and shiny right up to her death at 91.