HI, my elderly father leaked some urine on our 18 " travertine marblefloor, and we didn't notice until the "spots" look like water droplets but won't come out of the floor. What can we do to remove them? I have tried a product from the tile installers called Mira Clean #1, but it did not work one bit. I hope you have some help for me, I really like your site info, wish I had read it before I chose this type of flooring near a toilet, Sincerely, Marian