If you wanted it 100% gone you'd have to vac purge it under lab conditions, unfortunately that aint an option for most. I find as long as you keep the oil on the heat until it becomes very sticky and hard to work that this is the point that pretty much all the gas/alchohol is gone. The fact that it forms a solid glass like state shows it is purged as it would not remain solid if it still contained gas or ISO. If you light bongs/spliffs/ciggies with a gas lighter then you are inhaling a lot more butane from that, much more than this would contain. Seriously try it, it's the cleanest tasting thing you'll ever smoke if done right.
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