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So after ultrasonic cleaning the boards are somehow now much worse off hah. It seems a white residue has formed. I noticed this same white residue when I was cleaning the boards after pulling caps with a horse hair acid brush and 99.9 isopropyl. Does anybody know what this residue might be? The only way i have been able to get the residue to disappear has been Windex all purpose cleaner. I'm sure using this isn't advised and that certainly won't help for things I can't reach. Any advise?
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