I bought this Geneva Cutlery razor on eBay for less than £10 and it seems to be in pretty good condition. I've rubbed it with metal polish and it's cleaned off a lot of the muck, but there are still some marks on it, in particular near the toe of the spine. Do I need to start going at it with sandpaper? If so what grits will I need? I'm fairly confident I can turn this into a razor I will enjoy shaving with and will appreciate any and all advice that helps me get this razor into my rotation.