My lib had pretty dirty headlights, so i gave this headlight cleaner a shot (used it previously on my old car which turned out great).
results:
before
![Image](http://s15.postimage.org/twmhpjukb/WP_000133.jpg)
after
![Image](http://s13.postimage.org/esjdbzdmf/WP_000135.jpg)
cost a little over $10 posted from the states. works great as you can see in the pictures.
link: http://www.ebay.com.au/itm/280705018788