this has been covered a few times on a couple boards, but here's the problem. it's the mold that's been growing because of the water collected. to get rid of the smell. buy some anti-septic floor cleaner like pine sol and pour it into the intake vents that are right under your windshield wipers. after you do that, turn on the vent on and let the "cleaner" do it's job. i did it to my family's cars and it works. btw, i chose lemon scented instead of other scents because it would smell weird to have pine scent inside the car. haha. hope this helps you guys.