My sunroom has “plastic Perspex” type windows that over time become not see through (Not clear)
Usual cleaning products only tend to smear whatever is making them not see through
308700cookie-checkSunroom perspex type windows
Chemistry in the real world
If it’s on the surface, you’ll be able to restore it with Brasso. Rub until you feel it become smooth. Also works on car headlight covers. But if it’s not UV-stabilised plastic, it may well be that the hazing is all the way through
It sounds like the plastic itself has been compromised by the sun, rather than some other stuff. Not much you can do unfortunately.