A quick DIY fix would be to put a plate of baking soda to help absorb the orders.

If you want to have a professional tackle the problem, ask around until you find someone with a fogger they can use to really penetrate the entire vehicle.

They do sell things called "Oder Bombs" which you could use yourself and is similar in effect to fogger in the way it works. I believe www.topoftheline.com carries them.

Hope that helps.

George @ Detailed Image