hi, i have a st170 with the xenons, the car came with a sort of mist on the headlights (not condensation) and is to me letting the car down abit, i read to sand them down and polish them after so i gave one a little rub over to see if this worked but this only seemed to make it worst, id much appreciate it if anyone has any idea of removing this as its quiet frustrating, im not sure if it could possibly be limescale? any help is appreciated

thanks andrew