So, I've come to the conclusion that most headlights (polycarbonate) turn yellow and cloudy due to ultraviolet exposure.
We've all been through the process of polishing, buffing, and even wet-sanding, but the headlights will eventually return to their previous state: yellow, cloudy or hazy.
Well, I decided to try a new approach. After wet-sanding and polishing my headlights for the 1,000th time, I decided to use a special clearcoat that blocks UV. If my theory is correct, the UV-blocking clearcoat will extend the life (and clarity) of the polycarbonate lenses we all have on our headlights.
The purpose of this thread is to establish a timeline. In years past, I could sand and polish my lights only to have them fade and turn yellow after two or three months. With this new approach, I will install the lights and see how long they last.
I will update the thread as needed, and if my theory proves to be correct, we may all have a new technique for maintaining clear headlights. If you're as tired of poor nighttime vision as I am, this could be a good thing.