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i run into a similar problem with the plastic lenses on patrol car lightbars. They sort of yellow and turn themselves opaque after a few years.
I use a cleaner made by novus to get rid of the 'foggyness' that develops over time. I get it from our emergency lighting supplier but you could probably find it, or something similar, at auto stores or online. Possibly look in the boating section because its recommended for marine and RV plastics primarily.
I've also heard the sandpaper method, but never tried it. I'll give it a try tomorrow since i have an old bar in the shop right now.
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