I recently aquirred 2 vintage safety razors. one a gillette super speed black tip and the other a 1959 gillette fat boy. they both have some light rust and green coloring around and inside the doors. My only guess is to soak them in some CLR (calcium, lime and rust) solution for a bit, scrub them with a toothbrush the best i can and rinse really well. If this is a big MISTAKE then please let me know. Or any other better ideas are certainly welcome.. Happy Shaving!!