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The drip pan in all cars can be a harbor for all kinds of bacteria, wet environment and plenty of fresh air. I sometimes smell a mildew odor from mine but I just ignore it for now. One thing you can do is find the drain for the A\C evaporator and then mix up a mild solution of tap water and bleach, not much maybe a tablespoon of bleach in a quart of water. Then connect a hose to the drain and get some of the solution into the drain pan. If you can find a way to spray it into the evaporator would be better. The evaporator should have a small P-trap in it so as air won't blow out it and it can get mildew in it if A\C not used frequently. The bleach solution aids in preventing any growth in there.
If you go to almost any commercial HVAC supplier they have tablets that are for placing in drain pans that do the same but have a plesant odor in them. Just find a way to get them in there.
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