RE: Polish for canopy
That problem has been around forever.
I've not used the stuff for a canopy, but noticed something in an Auto store the other day that should work. Some headlight lenses have been made of less than quality plastic recently. They discolor and the finish goes flat. There are a number of kits to restore them. I'm about to use Maguire's kit on one of my daughter's car.
I've seen what toothpaste does on the butyrate we used years ago to form custom canopies. It gives less than perfect results but helps some.