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No, you can resurface them with 240-320 grit wet/drt silicon carbide sandpaper. Tape the paper to a flat surface, and lay the stone on it. Rub in a circular motion. Doing this wet with detergent & water helps considerably.
Stones can be cleaned by scrubbing with water, Barkeeper's Friend scouring powder, and a stiff brush. Wear rubber gloves.
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