I wash from my head to my feet but I wash my privates last! Then I wash my hair <3
It seems the same to me. A quick way to clean it up though is to use your bodywash or old shampoo-put some on a washcloth and wipe the walls while you are taking a shower. I do this most of the time I take a shower. I have no buildup on my shower doo...
While it is healthy to only wash your hair every other day, it is bad hygiene to not wash your body every day. Even a sponge bath would work. Everyone sweats, and your sweat contains salt and toxins that will be reabsorbed into the body if not washed...