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[–] Greysage 0 points 1 points (+1|-0) ago 

Agreed. A small nail file would be my next step if that doesn't work. Oxide grease is good to smear on car battery terminals to prevent corrosion/oxidization.

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[–] Call_Me_Kelly 0 points 0 points (+0|-0) ago 

Did this all the time when i worked on aircraft, it worked like a charm.