follow that smell

There is a dirty diaper hiding somewhere in my car. I know it's there. You can't deny its existence because anytime you open the door, a waft of definite stink hits you right in the face. That being said, I just can't find the diaper. Seriously, I feel like I have torn my car apart trying to locate said diaper. Under seats. Over seats. Behind seats. Today it struck me that maybe my husband planted a diaper somewhere in the car to inspire me to clean it out - on the one hand, it's worked. My car is cleaner. But on the other hand, it smells like a public restroom. So gross.