…because there isn’t a shower.
“Sweat doesn’t fall of you. The water just accumulates until it gets too big and agitated and falls off like a sphere of water. It then floats around until it hits something. It takes a lot of water to fall off.” Imagine huge water balls of sweat bouncing and crashing around mid-air.
Um, yuk. Especially when you take into account that the station crews have to spend an appreciable portion of each day exercising to keep healthy in zero-g. I’m sure the mechanics of making a shower work in microgravity are tricky (the toilet is bad enough), but this sure sounds like a human factors problem waiting for a solution. I wonder what floating globs of sweat do to station electronics?