First remember that the smell sticks to every surface inside the car, so you would have to clean them all. Im talking about seats, carpet, roof, plastics, the seat belsts, eaven the glass will probabli have some kind of smell.
So to be shure that you cover everything, I would clean the interior in sections. I would use a cleaning detergent like "Tuff Stuff" thats the one I use.
lets say you are going to clean a door. Then spray everything, glass plastics, eaven the switches (not to much on those). let it sit for like 30 seconds, then scrub everything with a wet brush, then use a chamoise to suck out the dirty water. (I bet it will come out gray, that is the tar.) after that part is dry use a towel soked in alcohol, & then put some armorall type material that has UV protection. (for the plastics only) You might want to spray some Fabrice or somthing like that on the carpet, seats, & seatbelts. (seatbelts are important because I bet that alot of the smell is coming out of them.)
2001 Blue SLE - 1995 Black SSE - 1988 Black GTA