Yes, I might say that I'm a pro on fogged windows. Thats is, in making them, not specifically restoring them.
I don't know how I do it, but I 've messed up quite some canopies. That has given me the opportunity to restore some as well.
Sanding with a high numbre grid is the first answer (try your local auto shop foor 2000 grid sanding paper, or perhaps higher)
I've got some Tamiya polishing paste. works ok
Toothpaste might do the trick as well. In the Netherlands we've got a brand that is reknown for its horrible effect on the teeth, because of the sanding effect. Bad for the teeth, means that it is good for restoring your canopy. It's the next step when having sanded with the aforementioned sanding paper.
Normal/decent toothpaste doesn't sand enough. It's just too sofisticated (it really is), and not harmfull enough. You can keep that toothpaste for it's normal apllication purpose.
Best of luck!
(another option is to buy a new model, and replace the kitpart, or to ask the manufacturer a replacement part. Give it a shot!)
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