Wipe the stain with distilled water (the minerals in tap water may leave a residue).
Next soak some paper towels in hydrogen peroxide and then fold them up and cover the stain.
Cover with plastic wrap to make a little "tent" and then tape the edges. We are trying to "sweat" out the stain.
After about 24 hours remove the plastic but keep the paper towels in place and let them dry out for the day.
Rinse and dry.
If that doesn't work call a stone restoration company in your area. They have poultices that can pull the stain out
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