Just wanted to pass along a reference for Aurora Clear Vue plastic cleaner. Last weekend I used it to clean the 13 year old back window of my convertible. It was in pretty bad shape with lots of cloudy areas.
The cleaner did a great job. One application brought it back so that I can see through it. A second should come very close to making it totally clear.
The Aurora web site is
http://www.auroramarine.com Cost is about $14 plus shipping.