my left front turn signal is extraordinarily Filthy. I've taken the bulb out and cleaned it up, and I've taken out the Socket thing the bulb sits in and cleaned up the 3 contacts in it. however, the receiver that the 3 pins go into is filthy and corroded too, How can I clean these up without damaging the contact points in there. This is The Front Left Signal.

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed