I just used this stuff called headlight lens restorer by blue magic. Or meguires makes a product called plast-x that works great also. Just picked it up at Checkers. Need to do another application but it cleared up mine just fine. Just my .02.
I used this stuff... http://www.bestheadlightcleaner.com/
It worked great. I got it at Advance Auto for $20 .Here's a before and after pic. They aren't the best pictures but it was late and cold outside so I was in a hurry.