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The best and most reliable option is to replace the connectors. However, you will likely be fine with just protecting the newly cleaned connector so it doesn’t re-oxidize quickly.
A light coating of Deoxit is most likely all you need. Any light oil would also work in a pinch.
Another option is to “tin” the connectors with a very light coating of solder. If the pins are brass, this is quite easy to do.
I would start with one of the above options, then if the issue returns, go though the trouble of replacing the connectors.