Nice looking razor.!
Yes..a careful cleaning with 3M should clean that up pretty good.
3M will remove some etching, if rubbed hard and long. Always test a small spot with a q- tip. If the etch is actually a stamp/engraving, there shouldn't be a problem, but it will lighten the black, within the letters. So don't use a rag, use something like paper, or a piece of leather from an old belt. Anything without loose fibers that can get into the etch/engraving.
Your razor would go well with the one I just finished. Its engraved into the metal. Light high grit sanding, and 3M brought it back.
Attachment 341594
Attachment 341595