I am surprised that no one here has mentioned Lotrimine. It is an anti-fungal treatment for athletes foot or jock itch. Any smelly foot can be cured in two days with Lotrimine. As for body odor that comes from our bacteria and some of us have more and different bacteria then others. It is not genetic and it is not racist. I sweat like a swimmer looks stepping out of the pool. I have washed my back pack once this year...just because. I work for a guy who reeks 10 minutes after he starts sweating. As for hikers, I smell their nasty clothing not their body odor.
As a side note. Has anyone here been to the Cabelas in Port Clinton, PA recently? I was their Friday and they have a new smell/scent program. I could smell it 500 feet from the front door and inside the store was noxious.