Vent foam
I have almost eliminated this issue by doing the following.
1. Close all A/C vents
2. Turn A/C on HIGH with air direction straight out (no upper or lower stream)
3. Turn vacuum cleaner on and place nozzle brush against each vent, opening only that vent.
4. Close vent and repeat with other dash vents.
The air pressure forced the foam pieces to come out of each vent. I did this over a year ago and have had only a couple of small pieces come out since. I may need to do this again at some point, depending on how much foam was left behind and when it deteriorates.
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