For a couple of weeks headlight moisture in my BMW 535i (F10) was bumming me out. Every morning and evening in the cold I had a mist all over the inside of my headlight and it looked terrible, and I'm sure was bad for the headlight electronics.

This worked pretty well for a zero effort situation. Some other videos will recommend a hair dryer, which I'm sure works better, but this is at least a step in the right direction and worked pretty well for me!