Dry erase markers are a convenient and versatile writing tool, but they can be difficult to remove if they are left on a surface for an extended period of time. There are a few different methods that can be used to remove old dry erase marker, depending on the type of surface it is on.
For non-porous surfaces, such as glass or metal, rubbing alcohol or acetone can be used to remove dry erase marker. Apply the rubbing alcohol or acetone to a cloth and rub the marker off. For porous surfaces, such as wood or drywall, a magic eraser can be used to remove dry erase marker. Wet the magic eraser and rub the marker off.