I am a big fan of Mr. Clean Magic Erasers. I always keep several on hand because, with 4 little ones, you never know what kind of mess is just around the corner.:)
I have let my children use them, too, under my supervision. Mrs. Blythe posted a link about a little boy who received some pretty serious chemical burns after rubbing his face with a Scotchbrite Easy Eraser. Click here to read his story and see a picture of his little face. My heart goes out to this poor guy and his mommy.
Anyway, I wanted to pass the warning along to the rest of you. I need to make sure I don't leave this "magic" product sitting around where tiny little hands will get it.