Jeff the Baptist explains the difference between 'man clean' and actual clean. He quotes a female blogger named Tam who writes:
I am beginning to think that guy's jeans have some kind of germicidal substance woven into them. Have you ever noticed that a guy could handle, say, fermented goat entrails with his bare hands and then, with a quick swipe of his hands on his trouser legs, he acts like he's now sterile enough for open heart surgery?
Jeff explains to a confused commenter:
Paul, you don't clean a shirt by "airing it out." You clean said shirt by putting it in the dryer for 5 minutes. Remember this simple equation gentlemen, warm = clean.