Foul body odor, for the most part, is generated from your feet, orifices, and where skin rubs against skin (armpits and between your legs for example). And there’s never an acceptable social situation where smelling rotten is better than smelling pleasant.
If you have bad smells oozing out of your forearms, you need to see a doctor because that’s a medical problem, not a hygiene problem.
We’re going to assume you already practice basic hygiene, and that you’re looking for something beyond that to deal with this problem.
If soap and water have failed you, the following should help…
Sweat the stink out!
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