Third, you need to shower right after working out. Some gyms expect you to work out, drive home, cool off, and then clean up. Not a good idea. Sweat can be reabsorbed through the skin. One of the main purposes to working out is to eliminate waste products.
Perspiration carries toxins out with it.
Bear in mind that the skin is the largest organ of elimination the body has. Once the toxins are out, keep them out. Notice all the bodybuilders with acne all over their backs. Acne simply tells you that the internal organs of elimination are overloaded and waste products that should have gone down the toilet are coming through the skin. The smoke and heat loosen up the wax in the inner ear while the vacuum created sucks it out.