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Use a cloth to do it...... Just a small amount.
See what happens. It might work... or maybe not.

Try some metal polish on a small area....to test it to see if that works.
I use Blue Magic and MAAS......I think any will work though. Read to make sure it is safe on steel.
Small amount. See if...

Could be rust..... light rust at that...... Try any polish?
Any sanding will take off the lettering on the blade.
What are the scales made of?