After trying virtually all the common atty cleaning techniques, I've come to the determination that no cleaning at all is my best bet. I do try to avoid the very dark juices, but other than that, I just keep my atty's plugging along until they will no longer produce a satisfactory vape. Then I buy new ones. Most of my attys have had at least a 2 month life span, if not longer. I strive to buy them when I find a good deal, and don't sweat the rest of it. It's not worth the frustration, IMO.