Getting Ballpoint Pen off Walls

My youngest found a ballpoint pen this morning and decided the walls in the entryway needed some enhancement.

So proud of his artwork

After scrubbing with soap and water, I grabbed a Mr Clean Magic Eraser. These are my last resort on painted walls since they do take off a layer of paint. Alas, after a good scrubbing the pen was still there. So I jumped online and googled how to get pen off walls and saw a few sites that said hairspray and a toothbrush. Spraying sticky crap all over my walls went against everything I felt was right, but I was desperate. I sprayed a little on and the pen got DARKER! Panic! But then I realized the pen marks were dripping and underneath was clean! Hurray!!! So parents, take note: HAIRSPRAY for PEN MARKS!!

I may need to wipe it down with a damp cloth, but that pen is GONE.