91% IPA works fine. 99% is better though i'm skeptical it really is https://www.quora.com/When-is-70-isopropyl-rubbing-alcohol-better-than-91
>> In the US, "rubbing alcohol" is mostly denatured ethanol (though "isopropyl >> rubbing alcohol" is mostly IPA), but always contains other chemicals as well. https://www.lewisu.edu/academics/biology/pdf/isopropanol_91.pdf IPA Water
