Don't do that, you may destroy the contact surface. Use antioxidant and cleaning fluid. Kontak and Deoxit are a little expensive but I think Radio Shack has something that will work.
Apply it on a pipe cleaner.
What I have seen, isopropyl alcohol cleans dirt but not oxides. I have tried Kontak and it is effective but costs about $40. Besides, you can clean all other connections too and get a supply that will last a few years. There may be something cheaper that does the same job, but I have no suggestion.
Thank everybody. Got some Deoxit from Fry's for $9 last night. Big difference between treated connector and non-treated. Used pipe cleaner for cleaning the the inside. Don't know how it work but the Signet tools looks good. I'm going to order some today.