WAM

Your vehicle will vary but here is a video link for a similar product and process.

MPawelek

Do you have a natural overly sensitive sense of smell? Do others in your 911 smell the same unpleasant odor? You may be one of those one in a million that smells things the average person may miss.

arcangely2k

Thx. I have a 996, which is very different than the vehicle in the video.

VII7

Do not apply bleach this will damage the interior and the evaporator over time.
Run full heat with engine warm for 5 minutes, turn off and apply foaming cleaner to heater case (not vents or anywhere else).
Smell will return if vehicle remains in same conditions, repeat procedure every 6 months.

arcangely2k

Heater Case?
As in, I have to go in underneath the car somehow, or remove the whole dash board to get to the evaporator?

VII7

You can go in through the blower entry or drain pipe.