I tend to use a sun shield on the outside, be it to protect from heat in summer or frost and snow in winter. My neighbour uses a blanket in winter with the same result.
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Just get a whole car cover at that point.
There's general ones that look like a dumpster might be under it, or bespoke ones for specific year/make/model.
You can even get one that matches a customer paint job on your car just to fuck with people:
https://www.motortrend.com/uploads/sites/7/2014/12/coverking-custom-car-covers-joe-ray-151.jpg
https://www.motortrend.com/features/1502-coverking-custom-car-covers
These guys make external windshield covers and other accessories for heavy snow and ice.
and of course there's Amazon. Amazon UK options - You may be able to find these available off of amazon
Personally I prefer a custom fitted internal sun shield in the summer, and a Snow Joe for the winter. The heatshield sunshield is reversable, so in winter you can have the dark side face outwards to absorb heat (I've never used it that way). The only thing, it's kind of a PITA to store as they don't fold (flat) like an accordian, they prefer to be stored as tube, so you can't slip it into a seat back pocket.
I also have the side shields for my front windows and so far (~4yrs later) they can stay in place without the provided suction cups
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