I know this is not exactly health related but I thought I would share. All of us know what sharpies are and how they threaten to never be erased. Here is how I clean it off of surfaces that are rather smooth like dry erase boards. The first method would be to use dry erase markers, write over the area and then immediately erase it. Do this till it is as clean as you like. There is a problem with this though. Dry erase markers are wasted. My second solution is to use rubbing alcohol. It generally works. The third method I can think of is to use skin protection and wipe the area with straight up eucalyptus essential oil. It is normally pungent in odor so some individuals may not want to use this last method. But for those who appreciate the odor, it can have pleasant effects on the home after use.??