I don’t sauna, but I do live in a desert. I mean, that’s gotta count for something.

Any fluid that comes out of the body has the potential to remove harmful substances. I wouldn’t reject out of hand the benefits of sweating, spitting, crying, lactating, vomiting, etc…there are even medicines to promote the excretion of bile via the gi tract.

Maybe I’ll get my CSF replaced every 100,000 miles just to be safe :)