I just thought I'd share a valuable lesson I learned today...well, actually 2 valuable lessons.
LESSON 1: Never leave a 2 1/2 year old child alone with your laptop and a writing implement. If you fail to learn lesson 1, please proceed to lesson 2.
LESSON 2: To get pencil marks off of your laptop screen, use Isopropyl Alcohol (AKA Rubbing Alcohol) and a little water on a soft cotton cloth.
The info I found said to mix 90% Isopropyl Alcohol with water in a 1:1 solution. Since I only had 70% Alcohol, I used a little more alcohol than water. Dab it on a clean soft cotton cloth and apply in a left-to-right motion until pencil marks disappear. Dry promptly with cotton cloth. Presto! Good as new.