ASt85: These are my IAQS notes taken from years of reading. I realize they don't address your question of cleaning. I'd guess something which reacts to vapors would wear out chemically and simply can't be cleaned.
Hope this helps.
IAQS sensor (VAG part #1K0907659) for pre-facelift cars.
p/n 08665059 is off a pre-facelift Volvo sensor.
p/n 31369324 (FCP no gots) is said to be for facelift cars (board member)
p/n 30676508 for facelift cars (board member)
Hella p/n 6PX-012-684-061 ordered through
https://www.worldcarparts.co.uk/air-...U?bSearch=true
p/n 8674719 (taken off a Behr replacement pre-facelift)
To WILLOW place: Careful when confronting (read that as "threatening") any woman. The "broken mirror defense" doesn't work for murder or assault.