Early Volvo S80 models have the same problem, my father's included.

Both of his headlamps have misted up since the car

was just over a year old, and now at over five

years, they're just the same.

With plastic reflectors inside a plastic shell, there has been no

degradation of performance, but they certainly look unsightly when cold (when

warm, the water evaporates). For this reason alone, I would

have asked for them to be replaced if it was my

car, and would do the same in your shoes.