If the glue is cyan or superglue, avoid acetone and gasoline (benzine ?) derivates ..... freon is good, but in a lot of countries now is banned ..... solkane is a decent alternative to freon ..... isoprophyl alcohol too, cause is one of the lipides solvent ..... also ethylic alcohol, but the damn denaturant left a lot of deposit, except when you use pure alcohol for food / cooking use (mean, the edible type, at least 95 degrees, no additives).
Edible alcohol is available in supermarkets (at least here), cheap ..... for isoprophyl one, you need to ask a pharmacist or chemical supplier, is becomed practically impossible here to find it pure, but the denaturated one is denaturated with isobutyl alcohol (for give it a smell and a horrific flavour
), not with state denaturant, so still no residuals, still enough cheap ..... for solkane you need to ask a company that already use it, cause, at least here, is impossible to find it in less than 50 liters cans (and buy 50 liters of solkane for clean a lens, cannot be defined cheap, LOL).
Only an advice, if you decide to use isoprophyl alcohol, use it in a well ventilated environment (acts a bit like ether), protect your eyes (very dangerous for direct contact), and overall, no open flames around ..... it evaporate very easy, and have a flashpoint of 15
..... a fan, or better continuous air exchange, is recommended
