Dielectric grease, hydrophobic variety if there is a choice, would help. Although the pin plating may be worn through at contact areas, removing all or most of the remaining will greatly accelerate the accumulation of the corrosion salts. These can also cause shorts between pins.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7