I cannot honestly say that my car smelled like crayons. I guess I don't know what that smell IS that you are describing. (As I am practically snorting a crayon up my nose right now to see what it smells like)
My nose isn't working correctly, I don't think... anyway...
When I bought my car Brand New, (28 miles on it) I hated the smell. I put a box of Arm & Hammer baking soda on the floor of the back seat and after a while the smell was gone. The new baking sodas have a fabric like panel on them so the baking soda won't spill out.