As with any antique that you intend to clean while retaining its original beauty - never use an abrasive of any kind. Soak them in a solution that will eventually dissolve or at least soften the crud. They may need to soak for weeks... then use a soft nylon toothbrush on them while they are still wet.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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