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this is how you do. i think what you have may is deep one
find 120 grit and stay on it utill you clean up everything. Remember all patina has to be gone.
Now big questions is this.
Does your...

you can bring it back but it will take a lot hand work.
start with
220,320.400.600.800.1000.1500.2000 sand paper. then move mass
.you will need to take blade out to do better job.
you will...