It is beyond cleaning... those coins consist of chrome-plated steel. Once the rust has formed in the steel, it is pretty much is what you see - not much chance of helping it.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
Sorry Lyn. I don't know as much as I would like to know about nickels... but keeping one like this will only add to the clutter as you add more coins to a collection.
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