i'm one of those "lucky" ppl with the crayon smell in their beetle. it's not that i don't like the way it smells but it just permeates into everything! even my newborn daughter comes smelling like crayons after a short ride. it's robbing me of that "new baby smell". so i went to pep boys (auto supply store) and came across "clean air's genie fogging air freshener." basically its just like a bug fogger where you place it in the car with the windows rolled up and set it off. you're supposed to set it off and leave it alone for 5 minutes, then roll the windows down and allow the car to ventilate for 5 minutes. i left it in there for about 20 minutes and i let it ventilate for about 10. i definitely noticed the scent from the product but didn't pick up any crayons
though this product was really strong, i hope it's strong enough to diminish the strength of the crayons. i will reply again soon to let you know how it works and if i'll need a second fogging. but so far so good
oh and i'm also gonna get the "clean air duct treatment for air/heat systems" so i can attack those pesky smells from every direction. it's supposed to work really well and is specifically designed to treat the molds and odors that are associated with the a/c.