Get some Naval Jelly and do it right, that's what the stuff is made for. One thing you need to know, Coke is rather acidic, that means it can eat into the metal and cause more rust and other problems than it cures. It will also work it's way under the chrome and cause the chrome to come off faster. I'm not saying it won't loosen up the rust, but if you don't get all the Coke off, will have a mess later. Use the Naval Jelly on the club, and driink the Coke, that's what it's made for.