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its wierd this thread came up. got my car back today. and it was about 80 outside. and i never really drive my car with the ac on. always just have the windows down. but it started to rain. and i got that smell. smells almost like a sewer. and tonight was the first time that has ever happened to me.
i bought an ionizer machine for local details i do. What i do is run it in the car for a hour with no ac then run it for an hour with the AC running. Works great. You can get the machine for 200,
Kragen's sells a spray that you can use to deodorize/decontaminate the vents. All you do is pop the hood, spray it in the Intakes/cowl (right by the wipers) and ta-da!