I think it is best to do as you have done with the brooch, or any badge, in my opinion. It removes heavy tarnish and corrosion, leaving it now to be stored in a good environment. The "leave it alone" faction can take solace in that it will certainly tone again, hopefully minus any corrosion.
CB
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"We seldom learn the true want of what we have till it is discovered that we can have no more." Sam. Johnson
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