I want to replace some SMD led's on a PCB. Last time I did it, some sort of residue builds up around the area that becomes very crusty and i'm not sure if that residue is bad to keep on the board and maybe it causes the board to detoriate? Question, how can I prevent his? I've tried cleaning with rubbing alcohol wipes but didn't seem to help. can the surround area not be masked or covered with something to prevent this?
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