This might be a good time to mention that for electronics 99% isopropyl alcohol is safest and
for disinfectant 70% is most effective.
This web, though commercial, describes all the concentations and why best quite well.
https://blog.gotopac.com/2017/05/15/why-is-70-isopropyl-alcohol-ipa-a-better-disinfectant-than-99-isopropanol-and-what-is-ipa-used-for/#When_Is_99_Isopropyl_Alcohol_Used