Digging through my clad and maybe found an encrusted war nickel

[Hunter101]

Is it possible to clean it up? If so how? I don't have any way of doing electrolysis. The year is 1944 and I think the mint mark is Francisco.

 

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[FreeBirdTim]

Soak it in mineral oil for a day or two and then chip off the stubborn crud with a toothpick or wooden skewer. Looks like it was in a fire...

 

[Loco-Digger]

You can try the way as stated in the previous post, but I'd use the tin foil, baking soda and boiling water method if it were me.

 

[mick56]

I tumble all my coins, except for the obvious silvers.