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Baking soda/water solution will break-down the corrosion. Trick is to get everything clean and dry. I apply the solution with an old toothbrush, then flush with water, then dry with compressed air. Protect yourself from spray, especially your eyes. To clean/polish the contact surfaces I use: emery cloth or very fine sandpaper, a fine wire brush, small knife blade, pencil eraser. Once surfaces are dry and polished, I use an electrical contact paste to prevent future corrosion.
The trouble with this type of corrision is it will travel up/down insulated wires. So what you see and can clean look fine ,it's what you can't see that is continuing to corrode. we found this out the hard way when we had commercial trucks and trailers in 4 feet of saltwater at the Port of galveston during the last big hurricane,.
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