OK, here is a great place for an Ozone generator. I bought mine from Amazon and have used it a few times in various vehicles with terrible smells in the, such as rat/mouse urine, cat urine, dead rodents and even with terrible smoking smell buildup. As long as you get rid of the continuing source of the smell, i.e. carcasses, cigarette ashes/butts, mud made from cat urine plus dust, stuff like that, the generated Ozone will combine with the biologic smell and remove it. Look it up on Amazon and see what the ads say it will do. There is also a Scotty Killmer video about it on YouTube. It will take a couple of hours of time with your vehicle all closed up and the motor running with the air on Recirculate at high speed. Pretty simple. The Ozone generator will even kill bed bugs, fleas, ticks and other pests that might have found their way into a bedroom or other room in your house. It kills anything that relies on Oxygen to breath, including cats, dogs and people, so don't sit around breathing that stuff.