I've used fresh coffee grounds with great success on various stubborn odors. Just put two or three open cans of ground coffee in the unit for about 3-5 days. Placing a can in the air vent return works best.
Posted 1 year 6 months ago
Sam Rodriguez
I don’t believe weed smell stays like that but my suggestion would be as above, go to a smoke shop and get products specifically made to remove the odor. But I also second that it’s likely another unit smoking