Get a new cabin airfilter.. (fairly cheap) and heat the car up, blowers on full power, top heat, open all venta and leave on for about 10 mins..
Also i know you can buy Car air vent cleaner... you spray the cleaner in below the cabin air filter and its meant to purifi the system... I have never used it or read muich into it so i suggust a little reasearch into it first! .
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