Been there done that, corn cob and walnut medium, beads, liquid polishers, it may clean some dirt off, but not what you want, in machine shops I have worked in, we would use whats called shakers. Same idea but we use stones and pebbles, hard medium to remove rust, dirt, burnt on oil what ever, took a few hours, also in the hopper was kerosene or lighter fluid. Rust or oxidation is very hard to get off steel, and get it down to bare metal, sometimes they come out with some removable anything and some of those products we would use in the military to remove rust or oxidation, very toxic, and very dangerous, and it would harm some of the metals. Your high carbon steels are easy to etch with the right compounds. Watch what you use on these razors, and above all be safe and know what you are using. We had these compound in the Marine Corps to remove paint from different parts on the aircraft, it was called baby crap, because it looked just like a new born baby's crap, small yellow like balls, you would sped that on the part, and man did it stick and was it toxic and powerful. Saved a lot of time and work, don't ever get in on bare skin. Chemical burn right away, keep it safe.