Do we have a Chemist in the house?

I need a solvent or some kind of a reaction to break up the haze which has been placed on a coin...What I think has occured is that someone used baking soda to try to remove toning on this coin....now I need to reverse the bonding reaction because I can see a great deal of luster beneath all the whitish film...if their is a chemist who might have an idea, I would appreciate it....
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