I suppose that a toothbrush and lemon juice would be safe.
I disagree with the brass being softer than silver, especially if it is stirling or above. Coin silver is a different story and if made of coin silver or lower, then it may be safe with a brass brush. Brass is certainly better than steel.
In either case I did not mention those because I have seen folks who don't know what they are doing scratch and damage silver. If one has the experience and know how, then that is a different story.
If the sunshine cloth does not work, then the oxidation may need the brush work. Again be very careful.
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