WFMW: Getting Stains Off Corian

Ugly eh? Genius me was emptying my pencil sharpener on the counter. Of course it was way over full and got lead shavings on the counter. So I started wiping them with a dry cloth and it left a little cloud. Then I got a wet dishcloth, wiped it and this is what I was left with.

Nothing got it off. I used soap water, straight dish soap, degreaser, and bathroom cleaner. Nothing. Now I know that you can sand the counter down (the beauty of solid surface) but I was terribly nervous about that. So after I was done scouring my sink with Comet I used the cloth. The reason I didn't use Comet in the first place was the Corian cleaning scare tactics. They said don't use anything abrasive, it will leave scratch marks. They said it would be better to use a fine grit sand paper. Well, they were wrong. It took it right out! No scratches, no damage! Apparently a little comet goes a long.