Removing Permanent Marker from a White Board

To get permanent marker off any hard surface; go to a craft store and buy a 1/2 ounce glass jar of Testors Enamel Thinner. Dip a qtip into it or dab some on a cotton ball.. then wip off with a paper towel! It works great!
On a white board however, the tip from gondodeb is true! Just go over the marker with a dry-erase marker and it will rub right off :)

The white board spray cleaner that most places with white boards should have will also take it off. And then get the jiffy markers AWAY from the white board. If they are left anywhere close by, it is a mistake waiting to happen.

I learned this from work. Take your good non permanent white board markers and write or scribble over the permanent marker. It takes it right off.