I recently acquired a Colt Cobra in Nickle finish. Looks as if it has been shot very little. Original grips are scratch free and look to have all the finish on them. The finish is slightly tarnished, but doesn't have any scratches. Can anyone tell me what would be good to polish the nickle with. Great looking little revolver, but I would like to clean it up. May try to post some pics later. Thanks for the help.