I bought this a few years back and it works really well, especially on older cars, I run it for 30min in our '14 Armada and it really cleans up the musty smell from the vents and neutralizes some of the odors that accumulate.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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2014 Frozen Silver M5, CP, B&O, 601s
1995 Mustang Cobra - 347 stroker