This weekend I picked up a cavalry carbine 91/38 & after cleaning the crud off it I can see most of the blue on the exposed surfaces is actually surface rust. So the question is what do I do with it? Option one is leave it, option two clean it off & leave grey metal, or clean & reblue. I know most collectors favour that brown patina to a refinish but no one seems to balk at a garand reparker. Whatever was numbered still matches & it was not refurbed after the war. What would you do?