Why is there a sour smell inside the car?

[AsherAnn]

The sour smell inside a car can be caused by an uncleaned air conditioning system for a long time, seat covers or floor mats that haven't been replaced for a while, or odors emitted from the materials used in the car's original decorations. Below are some related methods for removing odors from cars: 1. Method one: Regularly ventilate the car to maintain air circulation inside the vehicle. Before each drive, choose a sunny day to open all five doors of the car, let it air out for 2-3 hours, and ventilate; meanwhile, clean the interior, organize the items inside, making it both clean and tidy—killing multiple birds with one stone. 2. Method two: Use herbal formaldehyde cleaners by spraying them onto the vehicle's seats to eliminate odors. 3. Method three: Place some activated charcoal or fruit peels inside the car.