I've tried to bring vintage Durham Duplex blades up to spec giving them a soak overnight in cola (I guess Cilit Bang would do, but I had cola ) a wire wool scrub (carefully!!!) and then a hone/strop. Minimal success, but they looked nice enough for the purposes of display in old cases. I guess old SE blades could be done with a similar process, but regular DE blades would be a no-no for shaving and I think the wire wool scrub would remove any pattern on the blade anyway.