Actually, most people say it's best to use PGA (pure grain alcohol, like Everclear) or even Vodka... but why waste good booze???
LOL!!
I use 91% Isopropyl alcohol, as opposed to rubbing alcohol, and have never had any problems in over 4 yrs. of vaping.
(you can find them on the same shelf in most Drug Stores)
I
always wipe the threads off with a paper towel when changing tanks, and before putting on the charger... and clean with an alcohol soaked, but not dripping, Q-tip once in a while.
I even use it to soak my attys, heads and coils with, too, when they start getting a little gunked up. Just be sure to rinse those with HOT water and let air dry thoroughly before using again!!
I use alcohol and soak my coils in vodka over night..
Looks like we had the same idea, but I type slooooow!!