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<p>[QUOTE=&quot;ALittleBit, post: 425983, member: 8726&quot;]Another thought. I know for porcelain one can soak a piece full of old ingrained dirt in a solution of water and bicarb soda?? or similar - will have to check that - for a while and then a gentle rub gets it out or a lot of it out. Perhaps you could try, not soaking your piece as it will also remove paint or whatever, but a poultice of this bicarb solution left on the mark and kept damp for a while to see whether it softens it or draws it out?[/QUOTE]</p><p><br /></p>

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