While it's never easy to remove permanent marker, there are some things you can try. This is a guide about removing permanent marker from plastic.
By Jeremy 1
How can you remove Sharpie permanent markers stains from plastic headlamp lenses?
By Jeremy from Richmond, VA
September 18, 2010
I have had luck removing Sharpie ink with regular isopropyl alcohol from the grocery store or any drugstore chain. It doesn't harm most surfaces, and usually takes all the ink off.
By sakeitha 1
How to remove sharpie marker off the back of a TV?
Sakeitha from TX
By guest (Guest Post) Flag
August 22, 2007
Try aerosol hairspray. Our local "dented and dinged" grocery store marks their prices with sharpies and they have a sign at the registers to use hairspray if you want to remove the price. Worth a try.