Re: Aircon / ventialltion system smell- 156 SW
Ehhh the Alfa dealer just uses the cans - same as you, but they use the 'Pro' version.
Usually Forte air conditioner treatment, have a google for it, thats what I use when the 147 gets stinky. The cheapo stuff like Comma doesnt work in extreme cases.
Change the pollen filter first (ideally just take it out) then put the system on full recirc, high fan speed set the can off in the passenger footwell, shut the door and run away.
When the can stops leave for another 5 minutes then leave all the doors open for an hour, then fit the new pollen filter.