You can try to clean the contacts with electrical contact cleaner (from the home center or electrical supply house) and you can try using a very fine abrasive or tool made for the purpose. Depending on how corroded the contacts are, you may be able to make a satisfactory repair.
Remember though, if either the plug or socket is damaged and not making good contact, they will soon both be damaged and in need of replacement.
BTW: It's close to impossible to clean the contact surfaces of the female connector other than with the contact cleaner and repeated inserting and twisting the male part.
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