Thread: polishing the old boy

I just received my new but second hand shotgun today in the post .The gun is a side by side Gorosabel from Spain ,27inch tubes English stock and for its older age not in bad condition really .

I would like to enhance the metal work as age has dulled it somewhat to a rust colour state on the old nickle plating if that is what it is --any ideas people on how to do this without making a complete balls up????