I was reading life hacker and saw this little tutorial for removing rust from a Hand Axe, I cant help but feel the same thing can be done to an old steel razor
http://www.instructables.com/id/Electrolytic-Rust-Removal-aka-Magic/
I also suspect that you might be able to restore a greening brass razor the same way by using copper tubing or copper nails, or a bunch of pennies, instead of rebar, as to my knowledge, greening is just copper rust.
Have a look, the Pictures speak for themselves
http://www.instructables.com/id/Electrolytic-Rust-Removal-aka-Magic/
I also suspect that you might be able to restore a greening brass razor the same way by using copper tubing or copper nails, or a bunch of pennies, instead of rebar, as to my knowledge, greening is just copper rust.
Have a look, the Pictures speak for themselves