Is there any research or labwork on the health effects of vaping machine oil residue, and which manufacturers produce the cleanest wires and pre-built coils? I'm considering using alien claptons and other types of coils with increased wire surface but with their complicated shapes, with insides you can't reach, it is actually impossible to remove machine oils from the inside of such wire. This seems to mean that you can't really buy clean twisted wire, or coils, and have to make them yourself. Am I missing something and cleaning alien clapton wire and pre-built (RDA) coils is no big deal? RESOLVED: @JuicyLucy suggested buying from advancedvapesupply, who clean their wire twice after manufacture.