To remove permanent marker from plastics, scrub it with toothpaste and baking soda until it comes off. You can also scrub the marker off with an alcohol-based product, like hairspray, hand sanitizer, rubbing alcohol, or acetone. If you have a pencil, try buffing the marker off using the eraser.
You won't believe how easy it is! You won't damage the plastic and you don't need a bottle of special solvents.
About.com has a simple tip for removing permanent marker stains from hard plastic items such as lunch boxes and storage totes. We haven't tried this yet.