I park my 2006 Toyota 4Runner outside, and, after it rains, the inside of my car smells badly. i suspect that the moisture causes mildo. That said, I have two questions:
- How do I eliminate the odor?
- How do I prevent this from happening?
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I suspect your air vents are full of mildew that moistens and thus reactivates when it rains. The other possibility would be a leak where rain is getting into the cabin, but you would probably notice that.
If it is the air vents, I don't know a good way to fix it. When I had this problem, I sprayed Lysol into the vents from both inside and outside, but that left me with a hideous chemical smell in place of the mildew smell for the next few months. It did mostly clear up the problem, though. I suspect there are better cleaners that will kill the mildew without sticking around with their own smells for a long time, but I'm not sure what would be best.