I wonder if this is a Diamond Shield like film over the front. If do you should be able to see or feel the edges as it us not usually applied as a full area coverage so it is cut close to grill trim, headlights, mirrors, etc.
If so mfg usually recommends 303 Protectant as a treatment/ preservative.
303 is good product with UV inhibitors but it's not s miracle cure if the surface is poor.
I have used rubbing compound to "restore" chalky vinyl trim but dont know if would help Diamond Shield like film. I see lots of posts on removing it after it has degraded but no experience there.
Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD