The verdegris is the result of contact metal corrosion. Regardless of what chemicals you use (electrical contact cleaner is better but any good penetrating oil should also work), you need to scrub off the corrosion to bare metal. The bullet ends are no problem - use a small brass brush. The "female" receptacles are a different story. If you can find a very small cylindrical brush (think microscopic baby bottle brush - maybe jewelry or fine machinery supply?) that would fit, you would be good. In mild cases, just inserting the plug into the socket repeatedly cleans it up (but it sounds like you have a severe case). Trick is to liberally coat the connectors after cleaning to ensure future connection. I use Vaseline petrolium jelly; others use No-Ox jelly or the grease that you can find in an electrical parts supply - should keep the moisture out of the connectors.
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