Now that would be a good candidate to try BadThads verdi-care on it since it has the verdigris. It may also darken the orange surface oxidation and make it a darker Buffalo nickel. Other than that I think you either leave it as it is or try that product. Not a plug, per say, but anything else would leave you with an obvious cleaned coin.
Take it out and shoot it and put it out of it's misery. I have never been able to get that color corrosion off a Nickel. If you ever did it off it would probably be badly pitted anyway.
Is that a "split tail" I perceive on Mr. Buffalo? I would not do anything more than try a little acetone to get rid of the green gunk. It's still a pretty nice coin...with lotsa "character"...!
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