Musterole was mustard in petroleum jelly. You used it for sprains, colds, whatever. It burned like hell and you were not supposed to cover it. You can still make mustard plasters - capsaizin comes from peppers.
Old cold remedy - hot steam vaporizer aka "croup kettle," some liquid stuff like Vicks, Mentholatum for your nose, and Musterole elsewhere. You got better to get away from the cure.
Never heard of Pep Chew.
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