Army dagger - how to clean the blade?

Hello!

I’m new to collecting militaria and to this forum.

Can this blade be restored by using semicrome or some other similar product?
Or maybe an oxalic bath?

In the right light the spots appear orange/brown. I’d hate for it to rust any more.

http://imageshack.com/a/img633/6655/JRWaLu.png
http://imageshack.com/a/img903/6593/3rxM6w.png
http://imageshack.com/a/img908/2263/KoN4qR.png

I hope someone will give me some good advice on the matter as to what is the best way to clean this blade.

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