>> 5. Usage of incorrect or inferior materials in headlight lenses that
>> cloud over on upper mid-line vehicles - like the LH cars.
>
> While some models see it sooner than others, that's pretty much
> everyone's cars with plastic lenses. It's a function of the plastics
> best suited for the job. The UV/hard coat quality varies, but ultimately
> all the plastic lenses will cloud if the car is outside in the sun and
> driven or the headlamps are used. Even mercedes plastic headlamps will > cloud over.
>
> The only way to avoid it at present that I know of is to use glass. >