Cleaning bulkhead connectors

RE: Tinned or not tinned.
Some were originally tinned, some were not.
On my '67's bulkhead female terminals, looks like some are.
upload_2019-10-16_13-59-38.png

upload_2019-10-16_13-53-53.png

As were headlight terminals.
upload_2019-10-16_14-1-16.png

But others, like this one for the alternator field, were not.
upload_2019-10-16_14-2-45.png

So far, none of the male bulkhead terminals appear to have been plated.
upload_2019-10-16_14-5-38.png