I have a Blissett .50 caliber muzzleloading single barrel rifle in about untouched original condition. It has beautiful engraving on it, but there are some small "orange spots" on the engraving. I don't know if it is old oil or a very light rust. What is the proper way to clean this up or should I leave it alone? I don't want to hurt the value of it. An old gun dealer friend (Wayne Eikenberry) told me a long time ago that he used 4/0 steel with gun oil on it to carefully go over the engraving to clean it up. Should I try this?
