1) ISO won't kill you unless you're extra stupid and do something like drink a pint of it.
2) I rinse atties with hot water anyway. 70% ISO vs 91% ISO... lol who cares? Just get the alcohol out, blow it out/rinse it out real well.
3) Your title said rubbing alcohol. Now the real caution.... Some things sold as rubbing alcohol are meant for sore muscles and have other things in them like oils, fragrances, etc. So make sure you are using the proper stuff. The ingredient list should say "Isopropyl Alcohol, Distilled Water" AND THAT'S IT. If it has anything else, don't use it.
The 70% stuff doesn't evaporate as well, so blow out the atty real well and rinse since it tastes like crap.
For all the people that keep saying "ISO is poison, don't use it".... so is alcohol (vodka). lol. It's just a matter of quantity (and how it gets metabolized).
If anyone has any real info on rinses with ISO (other than the usual MSDS which indicates it's OK) and vaping, I'd love to see it. Otherwise, quit scaring people. Very small amounts of ISO get metabolized, and don't cause blindness or liver damage.... but if you're not blowing out the atty or rinsing it...you're too dumb to use it, so don't. Even the few drops in an un-rinsed atty probably won't hurt ya, if you could even vape it all.