How can I remove a wall rub on without wrecking the wall?

I have a rub on on my wall in my bedroom that I need to remove, but I don't know how to with out wrecking the wall. Any suggestions?How can I remove a wall rub on without wrecking the wall?
MAGIC ERASER!! Those things are like a miracle! It's insane what they can do.How can I remove a wall rub on without wrecking the wall?
if you do not have magic eraser and the walls are white use a cleaning product (like a bathroom cleaner with a little bleach in it)


and rub lightly on the wall...


that has helped me before