Air freshner
How about shampooing the carpets and seats? Ozone generators get decent reviews, google or amazon would be the source for one of those.







A number of people are recommending ozone generators. I've used one and it doesn't work as good as baking soda.
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What I do is I get the carpets out and blow air on them to get rid of the dust and particles on them. I also vacuum the floors and beneath the driver's and passenger's seats. I change the AC filter regularly as well.
Finally, the odor could come from the HVAC system. There are tons of cleaning products that can be sprayed into the air vents and blowing motor to get rid of the odor, admittedly I've never used one. See this video may provide you some insights:
if I don't use the rear AC monsters breed and it makes a smell - leave both running and freeze them to death every drive the usual smell is rotting bacteria on the evaporator.
It comes from dead human skin, legionella, other rotting dust, fluff and environmental debris. A perfect cocktail resides in the heater system of pretty much any age car. With monster growth needing time, food, moisture and warmth.
Its worse when you fiddle with AC, like switching it off - the monsters stop getting cold and you warm the moisture on the evaporator. Leaving it running like its designed to, slows / kills the speed they breed at. The age bit comes in as the car's had longer for the dead skin cells to build up their food supply.
of course it can be other smells from under the bonnet like antifreeze leaks [can also be internal at heater] or burning oil or not for long, CO from a leaking exhaust
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