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I experimented with "Iron Out" brand rust stain remover to clean an ugly debased 12g silver tetradrachm of Gordian III from Antioch I bought for $40 years ago and regretted ever since because it was fugly and wouldn't respond to the baking soda and aluminum foil trick or mechanical cleaning because the rust and copper salt crusts were too tenacious. I dissolved 40g of the iron out (sodium hydrosulfite and sodium metabisulfite) in 16oz of water and soaked the ugly bastard, removing it periodically to inspect and brush off in water, and after a few hours the rust and metal salts were mostly dissolved making it very easy to remove the few remaining spots of encrusted dirt, which took about 20 minutes under 20x magnification. Here it is before the soak.
