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No idea where this came from. Just noticed today. Can't tell what it is. I tried to scrub it semi-hard (don't wanna do too hard for fear of scratching) with a towel and water and did not succeed in cleaning. Is it oil/grease? Feels weird on my finger. Appreciate your help!

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To check if it is oil or grease, use a mild mixture of dish detergent and water. The marble looks well sealed, so soap should not be a problem. – wallyk Aug 24 '13 at 16:57
Thank you. What do I do eith the mix and how does it tell me if its oil or not? – rabbid Aug 25 '13 at 0:31
Dab some on a paper towel, wipe across the spots, scrub vigorously, rinse, dry, and look. If the spots are gone, it was either dirt or grease. – wallyk Aug 25 '13 at 0:39
Thanks. If I scrub too vigorously won't the marble scratch? – rabbid Aug 25 '13 at 2:21
Not with a paper towel. There is no need for much abrasion in this scenario. If it is oil, it will be soaked up layer by layer with each wipe. – wallyk Aug 25 '13 at 2:22

Bleach is safe to use on marble. Take a dish scouring pad and a heavy bleach mixture - wear gloves. Scrub away.

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