The fine, green Puma knife polish will do it. I generally use a small muslin wheel on a dremel tool. A stiff backed pad might be better as advised above for flat surfaces, but will be no help if you have deep relief engraving. Start with absolutely fine polish--it doesn't take much, and I would be afraid anything coarser would just make more work (and damage?) to finely polish it out. Storing it in direct sunlight will erase, but not polish it over the years, but you'll likely not wait around for that!...Steve
