It's an abrasive that will scratch shiny surfaces.  It's made of a type of
melamine.
  I have seen it put swirls and scratches in otherwise perfect finishes, so
I can't recommend it for use on your paint.

Mike B.

--------------------------------------------------
From: "Jeff Palmer" <jpalmer@MTS.NET>
Sent: Thursday, May 13, 2010 12:29 AM
To: <vanagon@GERRY.VANAGON.COM>
Subject:      Magic Eraser?

> Anyone know if the Mr. Clean Magic Eraser is safe on paint?  It does a
> great job removing tree sap off ... everything my 16 month old gets into.
> Thanks
> Jeff=