The front polycarbonate roof section, as fitted as standard on the Passion trim and a optional extra for the Pulse as far as I recall, and the rear (side) door fixed window section over the door handle on all variants of the 454, have a tenancy to craze and fog up over time. Freeglass are the company that supplied these parts. They also did the 450 and 452 rear windows as well (albeit to a lesser extent than the the 454), so my petition that I am in the middle of writing up also asks about those.