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If you just mean regular, everyday cleaning (as opposed to something like a big black ring where a can of axle grease sat on the table for 40 years or something), ammonia diluted in a bucket of water is the best thing i've found for cleaning marble. A soft toothbrush probably shouldn't hurt it, if you need to scrub it a bit.
All the windosills in my house are marble (there must have been a marble surplus in the early 40s), and for routine cleaning, I also sometimes use Windex, which has some ammonia in it. If it's white marble, though, I don't know if that would be a great idea.
Linda Zinn
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