Hoof, instead of compressed air, use a propane torch and run it up and down the barrels to dry them, only warm to the touch and not hot. Plus this will get the moisture out between the ribs. I do this with the barrels standing up and naturally the weep hole is at the bottom.
On some of the older "elsies", take the screw out on the short extension piece between the loop and water table to dry them.
Watch barrels for the next few hours for any residue that comes out of the hole and goes on the metal, wipe it off before it stains the barrels.
