Thanks all! Your information and tips have been very helpful, and after reading through it all, online research, you tube, etc. this is What I think I wanna do:
Use CLR for initial rust/tarnish removing.
Then, if necessary, sand off any remaining imperfections using very high grit silicon carbide sandpaper by hand. (Or use micro mesh instead of sandpaper. Whichever will NOT leave scratch marks. What is the better option??) the last step would be to use flitz polish to make shine like new.
What do you guys think?
And again, which would be better for keeping the blade scratch free? sandpaper or micro mesh? It will be done by hand btw. No machines or wheels or anything.