Interesting, I just asked my local bacteria expert and personal alarm snooze button hitter, she also says that they actually buy 95% for the lab but then dilute it down to 70% before using it to clean up.
Edit: she was less convincing when I asked her why I can't also just get my shaving iso alcohol from her lab...
Edit: she was less convincing when I asked her why I can't also just get my shaving iso alcohol from her lab...