What is this part that wraps around the tire area on the car, looks just like a plastic panel? Does anyone know how to make them shine again? Back to black does not work, i dont want to replace just bc of dull, any ideas.

3 inch Terrafirma lift and 265/75r18 installed (pics) - Land Rover Forums - Land Rover Enthusiast Forum

 

I use linseed oil. (a mix of natural terp and boiled linseed) I apply this to all my trim and bumpers to keep them looking new.
Deep clean, wipe on, wait 5 mintues) wipe off twice or until no more oil comes off on the shop paper towel.
Last longer than other products I have tried (still waiting for some parts to fade so that I can measure lifespan). If cleaned off well enough it wont create a gummy surface.

For more detail:
Get a car wash(hand wash)
Mask paint.
Scrub all dirt off with soap water and medium bristle scrubber. I use the kind that go on a drill bit.
Rinse off all soap with water until clean. Let dry.
Brush on thin coat of approx 50/50 Georgia Terpentine and Boiled linseed oil (the kind with hardeners, purified takes too long to cure)
Wait 5 minutes so it soaks into the plastic. If you see it soaking in right away its thirsty and apply more.
Wipe off with fresh dry blue shop paper towel (lint free)
Wipe of again with fresh blue shop towel, and really rub in the surface.
Repeat until nothing comes off on a fresh towel.
Let rest overnight on dry day, no rain. Depending on quality of the linseed oil.
Make sure there is nothing on the paint.

For me this works extremely well. It will not repair rotten plastic, but will "restore" plastic with surface oxidation/fading.
I have had people think that it was new replacement trim, even weeks after treatment.

I experimented with refined linseed oil but the results were short lived, it also rained heavy and did not have enough cure time.

Hopefully I understood your post and this helps.

 

I removed mine and it looks way better imo

 

Apply heat

Or just remove them to make Your D2 look better.
And while removing the stock fender flares, remove the rubbing strips from the sides.

 

Paint them with truck bedliner.