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It looks like gunk!or adhesive residue from tape! soak it in warm soapy water and wipe it off.
It looks like gunk!or adhesive residue from tape! soak it in warm soapy water and wipe it off.
If that doesn't work you can always give it a soak in pure acetone (do not use fingernail polish remover as it contains other contaminants). I usually go 1/2 hour per side with no problems to the copper plating. Just pat it dry,






















