No shit, I went against everything I read and did this last week with some 91% iso I was using to clean shit. Evaped then heat purged it at 200f in my oven for a little. Was pretty awful and I already regretted it the same night... then I got sick the next day. It may be other shit but I had held up well against seasonal crap up until that day. At first I thought my throat was sore from the harshness of the stuff, but the day after that, I had very bad sinus issues (and for the next 2days. I feel like 80% now - 4~ days later) Never again. Weekly (or more frequent!) iso+hot water baths now for any water pieces I'm inhaling through regularly.