Drugstore 90% isopropyl “rubbing” alcohol. Just don’t go putting it on clear plastic lenses, clouds it right up! Plastic polish is the only cure.
But rubbing alcohol is usually a good flux cleaner, that no-clean or water based flux is weird stuff though, stay away. Same with acid flux usually sold for plumbing, big no-no. MG Chemicals Rosin Flux Pen 835-P has never done me wrong. That and some good Kester 60/40 Pb solder and any old half functioning iron will set you straight, although why wouldn’t you just get an eBay $20 HAKO “Fake-o” 936? Great beaters and they take real HAKO tips and wands. - Lee
