I use unflavored moonshine, 140 proof or higher. Leave it in a bowl or something of it overnight, in the morning run it under some hot water but not super hot, dry 'em off real good and let 'em air dry for a good while, should be able to squeeze a little extra life outta 'em. Course that's alot of trouble for a disposable coil that I am usually too lazy and impatient to bother doing that, but meh.