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The rear side windows on the fortwo 450 are plastic and over time, they are affected by ultraviolet light.

I just used T-Cut as it’s what I had. Any cutting compound should be fine but you may need to use different grades.

Slap it on like you’re about to sunbathe on the actual sun.

Don’t even think about hand polishing unless you have arms like Popeye and days to waste. Get a polisher, ideally a dual action random orbit machine.

Even after only 3 minutes it’s looking much better.

Coarser cutting compound followed by medium and then fine will give even better results. Also, bothering your arse to to polish it for more than 3 minutes would help a load.
Once you get it to a suitable finish, it’s a good idea to protect it from further UV damage. You can use either:
303 UV Aerospace Protection Spray. This is what I use on the 451 polycarbonate roof.
Or you can finish it with a clear lacquer that protects from UV such as Rust-Oleum Crystal Clear Gloss. This was recommended by Xander.