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The problem with flux is that it is corrosive. If you use just the flux in the solder it shouldn’t be much of a deal, but if you use more flux I recommend washing it off.
I use 99.9% Isopropanol or an ultrasonic cleaner with water for this. If you use water do not use soap or anything else just water. Also make sure it is completely dry before connecting to power.
Did the same in school on a Z80