Personally, I would leave it. Patina is history. Each wear spot, scratch, scuff, etc holds a story for that firearm. I LOVE my old guns, and though tempted to refinish a few, I have resisted. I, for one would hate to erase history. Why try to make a 30 year old gun look like a 1 year old gun? As it is now, it's one of a kind. You shine it up and it will look like every other new safe queen Colt Commander.
Just my $.02.