What it is is that the evaporator inside the car under the dash gets a layer of milder/bacteria that causes the smell due to the constant moisture it pulls from the air via condensation. (hense the pooling water dripping from the vehicle when ac is on) What the cleaners do is pretty much make a bug fogger bomb out of lysol, which works great. I usually set it off in the front passengers foot well where the inside air intake is.

The only other thing that affects smell in the ac is if you have dead rotting leaves building up at your ac microfilter under the hood at the cowl.

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