Here how the rear deck looks like with obviously some kind of stuff deposited heavily above dear speakers. Also please note the black residue on let's call it left edge of the rear deck. I find this stuff all over the place in the car, mostly in the corners and crevices where detailer(s) didn't...
Found the name of the duct cleaner - it's made by IDQ - A/C & heater duct cleaner, worked very well for me previously. I also have 200 ml of Car Odor Remover , not sure who makes that but it suggests that it should follow Interior Car Cleaner with Odor Neutralized. Maybe they meant this one...
So it may or may not need another path over with extractor. BTW, still can smell although faint OdoBan, but I think something is poking through it. I can't believe I could not smell or feel anything the day I bought it.
I am very leery of using bleach tbh, it can eat away at almost anything and...