My 1999 A6 only has about 50K miles and I just had to have the left headlamp replaced as the turn signal was blinking very fast, but the bulbs were fine (fortunately, I have an extended warranty and it was covered). Now the right headlamp (the one not replaced) looks very "foggy" and old. Any advice on what to use to clean it and how? I want to try and make it look as new as the other (if possible). THANKS!!!