Isopropyl alcohol is used for cleaning flux residue after soldering. It is safe to use on top of the board.Is it also safe to use on the top of the board?
Isopropyl alcohol is usually specified as 99.x% and not 100% because it is hygroscopic. I think it's best to get the "100%" kind. With a 91% solution, the other 9% might not evaporate and leave residue instead.Is 91% good enough?