B.C.
Here's what I found:
How to Remove Pet Urine Stains From Marble
Instructions
1
Spray a liquid peroxide cleaner on the affected areas. Allow it to sit for five to 15 minutes depending on the severity of the stain.
2
Blot the marble with a soft, clean cloth. Do not rub the stain because it will allow it to set further it into the marble. Continue to blot the stain until you remove all the cleaner.
3
Repeat Steps 1 and 2 as needed until you completely remove the stain.
Tips & Warnings
Urine stains left on marble for long periods of time can cause etching, or a corroding of the marble. Sand the marble as needed and polish the marble by applying a marble gloss restorer product.