When I used to be able to get Red Man chew sometimes I'd hit it with some wintergreen or dark rum.
Wintergreen oil: 2-6 drops in a teaspoon of 94% drinking alcohol to treat enough chew to fill a skoal can.
Sometimes I'd use the rum when my chew would get a bit dry, just to hydrate it some.
Nowadays all I can find for loose leaf chew is this Big Mountain crap, I don't like it much.
Someday I'll figure out how to prepare my leaf to make my own, till then all I got to go to is $20 a can skoal.