Any help on cleaning green stuff from a nickel?

[FrenchCreoleCoin]

Found a 1925 buffalo nickel with this green stuff on it and I'm worried it needs to come off the coin. Anyone have a gentle cleaning method of removing this stuff?

 

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[gunner45]

Lemon juice works good, if that doesn't do it you may want to try a little vinegar.

 

[FrenchCreoleCoin]

Appreciate the advice I'll give it a go and post a pic

 

[boristhespider88]

I use salt mixed with vinegar. It gets the nasty gunky stuff off super quick!