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Not much, I suspect. Replacing the plastic would be about the only solution I think (which probably isn't cost effective).
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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The best thing is to replace it but there is a method that will restore the color to most plastics. It's caused by he bromine in the plastic and sunlight.
The simplest method that usually works is to use a mixture of hydrogen peroxide oxygen clean and a thickener like xanthan gum to create a paste. Coat the plastic keep it wet expose it to uva light and scrub it with a brush. This will usually work on solid plastics. Never tried it on clear but it's worth a try.
I want to get an enclosure like that for my mower too but I need a small airconditioner....
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I would try using some of the stuff sold to clean plastic car headlight covers. Go to an auto supply store and take a look at it.
Howie.........
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Is the yellowed window made of clear vinyl or is it acrylic plastic sheeting?
Any free advice given is worth double price paid.
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In 1969 my two year old Alfa Romeo's rear windows got yellow and cloudy.
I took some Gleem toothpaste, diluted it with a bit of water and polished out the scratches. It stayed clear until it started to crack and then I had it replaced.
Newer plastics have UV inhibitors that make them last longer. I would guess that any fine rubbing compound would work. The toothpaste was all that I could find back then and it worked fine (and had a nice minty smell too.
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