I purchased a Head light restoration kit from Meguiars at my local Auto store this weekend.
It is for those headlights which are milk white and /or have a dulll haze on the lens.
I used it on several cars and trucks as wellas my bus and it works pretty well. Only takes a few minutes per headlight depending on the amount of oxidation .
Comes with a buffing pad to attach to a small hand drill.

Also, I use the Sylvania Osram 'Silverstar' high performance halogen lamps which increase night time headlight vision by 30 % or more.