If you need to remove components with many pads, like connectors, it can be daunting without Low Temp Solder Wire. Chip Quik. Btw, I use acetone for cleaning PCBA's, and actually almost every day, and right now, in a professional R&D lab. Residues of soldering wire, after SMT component removal, before new component gets in - it goes away with cotton bud soaked in ace in a few strokes. Never destroyed anything in my whole professional life, 35+ years now, working in consumer and industrial PCBA repair service. Isopropyl works of course, but slowly, and not so clean pcb stays. Depending on the type of soldering wire. I never use lead-free for repairs. During soldering though hole, you need few seconds to heat up the pcb copper and a component lead. They should be on on the same temp for second or two when solder gets melted around. You can even see pad hole capillary sucking melted solder. I've seen young people soldering THT, by shortly touching component pin and and a pcb pad. This looks baad.