Here is a product which I have recently used on a jet canopy with good results, it's a dedicated plastic polish designed to renovate and clean the 'plastic' windows found on many classic convertible motor cars.

Works wonders on canopies

[link]http://www.renovointernational.com/products/products.html[/link]

marc

For us Norte Americano types, most FBO's (and plastics supply houses) carry Meguire's plastic cleaner and polish (2 separate products), works great on our thin/soft model canopies. Also polishes up Ultrakote/Monokote like a champ. Also works well on oxidized plastic light lenses (tail lights, etc) on cars.

Barry

Not sure what it "really" is, but you can also use Honda Clean for plastics. Comes in a spray can and runs about $4-5 a can at a Honda motorcycle dealer. It's designed for use on motorcycles, ATV plastics, helmets, etc. It's not a wax, and the stuff works awesome. I usually buy it by the case from a buddy who owns a Honda/Kawasaki dealer, I think it's 12 cans to a case.