I know the general recommendation is to use Everclear or vodka. I haven't had a drink of alcohol in 22 years, but I see no good reason to keep a bottle of potable liquor around for cleaning my gear if there is reasonable alternative. I just bought a bottle of 70% Isoppropyl alcohol for this purpose from the drugstore. It should be a better solvent than vodka at 140 proof, and it evaporates cleaner than ethyl alcohol. A water rinse should remove any unevaporated alcohol, not that there is much chance of harm from inhaling a miniscule amount of isopropyl. I currently dunk my minipro heads in near boiling water, then rinse in running hot water, which works reasonably well on the exposed wick but probably doesn't do jack for the portion inside the coil.