Good luck - the site Taz_Zoee found has a good article, I like the idea it gives of letting an odor absorber it in the car overnight, then a good cleaning afterwards. A couple of boxes of baking powder ought to do it!

Many years ago, a certain brother of mine spilled a banana Fribble - so ice cream, banana and milk - in my car. Try as we both might, the msell never reallly did come out. After one attempt with a really strong cleaner, it DID change from smelling like old banana on humid days to smelling like chemical bananas on humid day .... thankfully, it was an old car, and eventually died one night on the streets of Somerville, MA, although I am sure in whatever junkyard it ended up in in Southern Worcester County, on humid days, the smell of chemical banana still wafts through the air.