Moisture inside windshield
A few days ago, I had to drive for 2 hours around 3 am in the morning. It was about 54 degrees and when I stopped for a bite and left my car for about an hour, I came back and about half of the windshield had mist/fog on it. So I went on my way and used the defogger. In a few seconds, fog/mist was gone except for the bottom middle section of the windshield. I cranked up the defogger but it didn't do anything. I stopped and looked at it and noticed that the mist was inside the windshield and there were even a few drops of water trickling/settling towards the bottom. I don't know what could've caused this. I did not have any windows open. No open liquid containers inside the car. No liquid spills. Any ideas? Leaky weather seals? I did take a picture of it which I will post when I get home.