I use the mr. clean magic eraser for everything! I love it.

However...just as an fyi..don't use it on your skin. Yeah, Yeah laugh all you want. I had a spray on tan that was wearing off unevenly so I used it to remove the tan. I was gently and didn't scrub hard or anything. I was so thrilled....for about 15 minutes. Then I felt like I had a full body rug burn.
Not nice.

otherwise, these things rock! I think they are just white melamine foam.