Out of curiosity, what sort of isopropyl alcohol did you use? The 30/70 (alc/water) from the store, the less often seen 90/10, or 100% pure isopropyl alcohol? Companies such as Digikey and Mouser sell the 100% (well, 99.9%) pure stuff and it works tolerably well provided the solder had an ammenable-to-cleanup flux. The 30/70 stuff leaves a mess; I’ve never tried the 90/10 myself. What works best for me is to use solders with “no-clean” fluxes and to just not worry about it.
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