I am a bit wary of using industrial alcohol even if evaporating it. If I am being needlessly paranoid here, that would actually be great, because industrial alcohol is a lot cheaper than the 96,2% alcohol I bought (which can be used for cooking etc.). So, it is safe if I evaporate it...? One reason I am paranoid is because they are stored in plastic bottles and am fearful that the alcohol soaks up toxic stuff from the plastic that would then be left in the residue?