re: "Dear Killz" Advice and Help Column

Killz, I had a leaky icemaker in my refrigerator, and it's left some white water stains on my brown ceramic tile floor. The tile has a rough surface, not slick, so the tile isn't completely sealed. I've tried various things to remove the stains, but nothing has worked. I'm now preparing to sell my place, and really need to get this cleaned up. It's not dirty, just unsightly. I've tried CLR, baking soda and vinegar, and regular kitchen cleaners - none have worked. I think the stains are down into the tile.

What would work on rough tile to get the stains out?