Cleaning marble tiles?

[alleycat]

My friend offered me the extra marble tiles she had left over from her bathroom renovation (5 years ago). The majority of the tiles are in boxes but she had left a good amount out, either sitting in her garage or in her yard. The ones in the boxes are in great condition. The ones left out are covered in dirt and have yellowed. Any way to clean these tiles? We would have enough for our half bath if we can get them cleaned.



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