This tile is on the restroom walls in an upscale doctors office. I perform both there floorcare and janitorial. The owner was curious if I could clean the scale from where people grab the towels and drip down the tile. Also under the hand soap dispenser there are drip marks. Any ideas? I scrubbed it down with a neutral cleaner and it turned even more white. It looks decent in the photos because the stone is still wet.