Hey,
I am from Mexico City and I have noticed the same problem with my crossfire, I have noticed my low lights are fogged many times and yes its usually after rain and the weather changes and its warm.
Please let me know if any of you guys get any positive response from a dealer so we can all fix this problem. I guess its a factory problem with all our cars which really sucks!
I have HID as well and I thought it was because of it, I can see I was wrong...