Hate to tell you this but very fine sand paper probably wont clean it off, when I used to oil quench blade this was my least favorite part I was never really excellent at getting them easily cleaned. I switched to an oven, stainless steels, and HT foil, but thats a different page in a different book even.
I don't have any tricks to easily do it besides resanding it, if you got a good hardening and the quench blew most of the scale off, you might be able to start in the 120-220 range.
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