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This stuff is great! Easily removed the copious amounts of crayon from my walls. Though I suspect it works by just removing the top layer of paint (but then since you can't paint over wax crayon, what else can you do!) As on previous reviews, it does disintegrate pretty much immediately but since it did the job it was supposed to do, I'm ok with that. Would just suggest that you wear gloves while using it.
This is the best Eraser to use. Had been trying for ages to remove the black smoke left behind on my natural stone fire place, and was amazed how this little power scrubber remove it all and bought it up looking new.