I have a few bottles of 30ml extra sweet blueberry high pg juice, its nearly too sweet to vape on its own, i have a lot of lousy tasting juices and crap cocktails, so i just half fill up these with the extra sweet blueberry and the extra sweetness just overrides the nasty tasting juices 100%, really works well and i've saved loads of ml's of crap juice this way. Anything you do with a really crap juice, besides binning it? Thanks...