As time goes by, the coils and wick get gunked up and there comes a moment the flavor diminishes. Before I would dry burn my setup and was good to go, but sometimes when doing that dry burn, the wick would get too hot and get brittle or mess up my perfect setup. If I dry burned a little less, the coils would not get totally clean. So today I dumped the whole RBA (Cobra), including the tank in an ultrasonic bath with pure grain alcohol for a good 40 minutes and voila: coil and wick clean as a whistle and the setup is like new again. So the myth that the wick will loose it's oxidation has been busted.