Ok. I understand using alcohol pads on bead blasted aluminum. Water would do the same thing, but is not conducive to using on a friction surface. Plus, the aluminum surface is pretty much permanently conditioned as long as the striker used is softer than the aluminum.
But now I am seeing alcohol pads being recommended for almost every surface. Why? I understand that it evaporates and leaves the surface dry, but what exactly is it removing? I'm missing something.