It is the anti-perspirant that undergoes a chemical reaction with sweat and leaves marks. Switch to a deodarant only (only ethylene glycol, gel, and fragrance in those) and you should be set. If you have a sweating problem, then you are out of luck if you want to control it and prevent the stains. Don't worry when you work out though, cuz you will need to sweat. The fragrance is there to cover up the scent of your body odor.
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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