It is a very common occurence. We see that every day. Its like a disease – yellow, cloudy headlight lenses. I even saw them on cars at the local carwash. It befuddled me that these people would take such great care – washing, vacuuming the interior, removing the floor mats and even hand drying their cars, but they still had those yellowed, cloudy headlights. Its not just a problem on old, very used cars. It is prevalent on 2 – 3 year old cars also. It doesn’t matter if it is a Dodge, Ford, Mercedes, or a Porsche.