Is sweat necessarily unclean for everyone? Or does the clean factor vary according to individuals?

Some people prompt a shower immediately after a work-out session. I wonder if that’s always necessary. What if one consumes health-conscious food, drinks clean water, lives in air-clean environment, maintains high hygiene standard, has clear skin, has non-sticky sweat, and has no body odor to begin with?

I’ve read that sweat contains a trace amount of minerals. That can’t be all “dirty”, as in urine, which is purely the body’s fluid waste.