Just had a quick go at using this headlight restoration kit from Amazon:
http://www.amazon.co.uk/gp/product/B002FUYXQK/
Only got 15 minutes spare for each side, which is about half the recommended time, but the results are instantly better.
It's totally removed all of the "foggy" affect from the units, and I think if I spent the other half an hour on the car, it would look brand new.
Cannot recommend it enough!
before:

after:

http://www.amazon.co.uk/gp/product/B002FUYXQK/
Only got 15 minutes spare for each side, which is about half the recommended time, but the results are instantly better.
It's totally removed all of the "foggy" affect from the units, and I think if I spent the other half an hour on the car, it would look brand new.
Cannot recommend it enough!
before:

after:
