Grinding melted latex off a pizza stone? My fiance and I got a pizza stone for christmas, and are still learning how to use it. Tonight we accidentally used a potholder which had silk-screened designs on it, and almost immediately the white silkscreened lettering (I believe it's latex) had melted off on to the pizza stone, so we now have big white splotches that we can't get off (tried steel wool, scrubbing with water, etc. No luck on anything.

I'm considering hitting it with an orbital sander because at this point, I figure it may be ruined if I don't try something more drastic. Has anyone done this, or used something like a dremel to grind chunks off of a pizza stone?
It won't suffer much from having a millimeter or two of material removed in one area, so I'd just go ahead with the Dremel and grind it down to clean stone rather than resorting to chemicals that may or may not work and may or may not impregnate the stone.  There's no substance made short of diamonds that can resist a grinding wheel.  Worst case is you end up with one side that's unusable for anything that requires a smooth surface, but otherwise it should be fine.  It's mainly just a rock, after all.