According to Fred Leslie, who was a payload specialist on Columbia, &quot;There is no shower on the Space Shuttle. &quot;Bathing&quot; is like a sponge bath. Just squirt warm water into a bag of body bath and wipe yourself clean and dry off. We also use a &quot;rinseless&quot;shampoo. Just lather it into your hair, moisten, rinse, and wipe off. It actually works much better than it sounds.&quot;