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At $25 a gallon for food grade glycerin that would be the way to go. One order and yours pretty much set for life.

I don't have any vitamin e caps but I keep a big jug of vg in the locker for...

I would think that even if someone were to use way too much preshave oil, with the brush being wet you'd be very unlikely to pick up much, if any of it. It'd be like trying to wipe up some spilled...