Nail polish remover is a great way to remove ink from permanent markers, but not everyone keeps it on hand, especially in the workplace. Instructables user Candymanproductions shows how you can make a permanent ink remover pen by adding nail polish remover to a dried-out highlighter or other marker.
The crafting of the permanent ink remover is pretty simple: cut the non-pen end of the marker off with a knife or hacksaw, fill up the cartridge inside with nail polish remover and tape the cap back on with a heavier-duty tape (such as electrical or duct tape) to make sure it doesn't leak. You can also use your new pen to remove hand stamps.
See the full instructions and step-by-step photos at the link below.
Make a permanent-marker-remover! [Instructables]