advise sought: dull paint 'patches' on my TVR

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Hi all

I've recently noticed my TVR has a patch of dull (slightly 'milky') paint-work over one of the rear wings.

Any suggestion for getting rid of this, or even is it possible?

The paint is a non-metallic blue and is 18 years old - oh and is on fibre-glass obviously. The car lives outside. Most of the rest of the car looks fine though (except for some clear-coat damage on the boot) and I try to look after it - Meguiars three stage and clay every so often - although not recently!

Suggestions really appreciated.