I would suggest calling a car repair shop, and explaining your situation, and see if they have a suggestion. They may recommend you bringing it in, but tell them you'd like to clean it yourself, see if there is something store bought you can use. My daughter's got crayon on our seat in the car, we have that suede, or cloth material, and it took I think enamel to get the crayon off (which most car repair shops have.)
You can use a little paint thinner it stinks, but will lift most stains. Dab a little on with a rag or sponge. Then you can shampoo it out. Use a brush to gentle re-fluff upholstery. Good luck!
Login using the form on the top of the page to post feedback (if you are a registered user). If you have not yet registered, click here to do so. It's FREE!.