hahah My 03 is exactly the same. From my understanding it's caused by the dust ect on your lights being essentially baked on with the heat from your lights.

There's a few other ways to clean them up. A toothbrush with some toothpaste works quite well, or same thing as the Meg's but made by Mothers.

__________________
Osama Bin Hooning
Senior Terrorist Operative
Perth-Wrx