Cleaning bulkhead connectors

Dana67Dart said

Terminals are tinned or plated and if you use an abrasive to clean them up you might expose the base metal underneath and corrosion can start.

I would use contact cleaner.

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Tinned? None that I have worked with. I have saved harnesses from 10 or more cars and have not noticed any that were not brass colored. I clean them and they shine up like a penny...almost.