Post by
Jonzini »
https://forums.nicoclub.com/jonzini-u294966.html
Wed Mar 04, 2020 5:45 pm
Can't speak to shampooing the HVAC ductwork but I had something similar on a previous car. It was recommended on another forum to spray Lysol at the HVAC intake at the base of the windshield (not to be confused with the engine air intake at the grill). Don't go crazy with it but turn on the A/C, outside air. Let it run for a few then spray the Lysol at the intake. Do it a few times over a few days. Worked for me and it may work for you depending on how bad the smell is. You'll want to drive around with the windows open after each attempt as the Lysol smell can be quite strong.
Good luck!