Yes, it really is magical!!
It removed some all too carefully done marker or crayon (not sure which) that a certain 2 year old boy had applied to our masonry on our hearth. He even managed to stay in the lines of the cement.
Of course, since cement and the Mr. Clean are not meant to be used together, we did go through 2 sponges. Since then I have taken stock in 2 more boxes.
I am sure that this is not the end of the artist formerly known as Houdini.