Originally Posted by CGMike
Get some lysol disenfectant spray and pull your cabin filter. Spray that down into that area with the fan at full blast. There might be a little bit of mold or mildew in the ducts
Dont bother with Lysol. I had a horrible oder in my car right afte i purchased it. I bought a solution that I found from a manufacturer locally to me and it worked so well i couldnt even tell there ever was an oder in the car. The product is called Biolife
Here is the link. A little pricey at 28.99 but totally worth it.
maybe you can call them and ask if they have a smaller quantity. you wont need much but i ran my AC and sprayed every inch of carpet and let it suck through the vents. The oder went away fairly fast and has never returned. I know this company sells to dealers who are looking for a fast fix to sell cars. They claim that they used the solution on a vehicle that was filled with smoke order from a person smoking in it and the oder went away. I of course cannot confirm this as I dont smoke.