I told one of my friends about my shirt and rubbing alcohol last week. She told me about crayon and WD-40. One of her kids had left a crayon in their pants one time when she did the wash. It didn't cause issues in the washing machine, but it did in the dryer. She looked up a solution online and found that you could spray WD-40 on the crayon smudges and then wash it out and wash the pants again. The first two batches, she let the WD-40 sit on the jeans for 30 minutes and then washed it out. The last pair though she forgot and though the WD-40 dissolved the crayon, it left an oil stain behind.
Her advice when you find crayon on clothes after they've been in the dryer?
1) Wipe out and clean the inside of the dryer drum well. Baking soda and a damp rag will get any off that doesn't come off with a rag on its own. If you're still concerned, wet down some old towels and then run them through the dryer first to make sure no crayon is left behind.
2) Spray the crayon spots with WD-40 and let it dissolve the crayon. Wait 30 minutes and then rinse out pants. Run them through the washer and dryer.