I just came across your site today and proceeded to try the tips for removing the old fashioned crayons from light colored painted walls.
Using the Baby Wipes did not work at all.
Then I read about the toothpaste but did not have any without dyes.
Then I read about the soda. So, I used a Lysol wipe and just a little soda. To my amazement, the blue, yellow and green crayon marks came off without disturbing the paint and the Lysol wipe cleaned the wall at the same time. I used circular motions and changed wipes a couple of times.
Thanks for your suggestion. I felt this modified tip might help others with the same problem - A two year old with crayons.
Your great tip saved repainting my walls.