Dull patches on GRP front panel

Teemac
Teemac Forum Participant Posts: 5
edited January 2015 in Caravans #1

I have a 2013 swift challenger with white gloss GRP front panel. I always wash whole exterior with Fenwicks caravan cleaner (as I have done with previous vans). Towards the end of the summer I noticed a few 'dull', almost grey patches on the front panel
only. Non on rear or sides. These are definite patches, some approx 50cmx150cm - not spots or streaks; and in various positions on panel. They are also slightly rough to the touch. I have recently also noticed a pale lemon hue to the front grp abobe the black
panel that surrounds the sunroof. Does anyone have any ideas, or similar experiences? I spoke to dealer when puting van in for service, but he's stumped - also couldn't see patches due to rain.