Some plastics (quite rarely now) are not uv resistant and you get surface fading of the colour pigment when the part was first moulded plus the plastic starts to break down.
It really depends how deep the fading has gone, however it might be worth trying something like T-cut or windscreen polisher (used to remove wiper marks & shallow scratches, Ive used this on my Octy vrs plastic headlights with good results).
The screen cleaner is the finer paste so I would start with that, then a quick polish.
If the above doesnt improve appearance there is always a breakers yard /ebay or if your feeling brave a main dealer.
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