I use IPA for cleaning and removal of flux in a fair number of projects, including cleaning my glasses
. It will also remove/dissolve permanent marker ink from surfaces, organic oils/fats especially those associate with cooking i.e. glass oven doors etc and will free up model IC engines that have become locked up after not being used for an extended period; a quick squirt sown the carb and in the exhaust ports leave for a little while.
I Buy IPA from CPC which supply 400mL aerosols or cans up to 1L.
HTH
Martin