Speaking of this, I'm dealing with the plastic tanks, which I hope to be moving away from soon and switching to glass. Even after I switch flavors and try to clean out the atomizer, the taste of the previous flavor still seems to be the only thing I taste. I switched from a Mtn Dew flavor, for example, to an RY4, but all I'm getting is Mtn Dew. Is there a good way to prevent this? And will a glass tank help?