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Check everywhere, even in places that are hidden from you view like under the floor mats and seats. Look for any traces of moisture or mildew. Use your hand to feel around in places you can't see. Make sure they are mold free and are not moist when you touch them.  Let the automobile sit in the sun with the windows rolled down to dry out. Brush away any loose mold from the upholstery. When the A/C is running, water condenses and attracts dust, spores, pollen, and other germs. This later forms fungi and causes a mildew smell that can be treated.  Use an odor remover spray to treat your car's A/C every year. Spray the odor remover into the A/C vents to eliminate odors caused by stagnant water, bacteria, and mildew.
Inspect the interior of the car. Examine the upholstery on the front and back seats. Inspect the air conditioning system.