My 17 year old Acura. I recently replaced the blower motor and cleaned the whole blower assembly out, and every panel in this car has been cleaned many times, a lot of them even on the backsides. Never smoked in. A lot of people compliment the smell of my car when I use it daily (They say it smells new, I think it just smells like 303), but if I let it sit for a couple days it gets a strong old-car-smell, a different/worse smell than the average closed-up-car smell. I don't see how it could possibly be mold, do you guys know what it could maybe be?