How do you get permanent marker off of a locker? (2 months)?

My friend has that on her locker, too, and it's all over her locker number, so it's hard to read what she is. Thing is, she didn't get fined because she wasn't the one who did it, and my Principal and Vice Principal know that. So if the marker stains were from past years, just say they were from past years! If you take the blame on all of this, Just tell your Principal and/or your Vice Principal that you tried everything to get it off and it just won't. Maybe they'll help you. If you can't get in contact with your Principal and/or your Vice Principal, try asking a student you're friends with or a teacher.