I've just purchase a certified pre-owned 2002 E320. It is in excellent condition (42500 miles) except that the interior smell is making me cough when I start driving. Its seem to be coming from behind the dashboard area. I not sure. I've tried using Lysol , Febreeze and other disinfectants. The disinfectants will last a couple of days. Do you think a Professional detail shop could help? Anybody experience this?