Exterior Vinyl Trim Maintenance

[rthomaslyons]

I have a 2015 Flagstaff TT that is in the beige and brown decor exterior. Much of the dark brown and black vinyl trim like the propane tank cover, exterior fridge panel, etc. gets a chalky and dry look to it and I would like to rejuvenate the look to give it the crisp dark look but find that Armorall or similar products don't last very long. Any suggestions? On another note the beige fiberglas exterior which had the Diamond coat applied when new 3 years ago still looks great. I apply a coating product called NuFinish once a year and it keeps the outside looking great.

[mjones12]

I've tried 303 Aerospace on my black propane cover but didn't work very well. It's really a sun protectant.