Peter, I had the car ceramically coated and the detailer told me that if you even so much as breathe on the gloss black trim it will mark.
He was saying he doesn't know why manufacturers still use gloss black, even though it looks cool.
Even from new the car had fine swirl marks on the gloss back bits, and were polished out with a single stage detail using a machined rotor pad and polishing compound, and then coated with the ceramic to protect it from future swirl marks when washing.
The best thing he told me was to get them wrapped in a vinyl wrap if it bothered me that much, as the gloss black ascents are really soft.
I would suggest a normal car polish to try and buff it out.
DO NOT USE T-CUT AS IT HAS A CUTTING AGENT AND WILL DEEPLY SCORE THE ASCENTS EVEN MORE.
Am not sure if it's just a coating but more likely the black is added to the plastic and through it, otherwise you would see the different coloured underlayer when scratched.
I bought the side strip protectors which are white on the rear but gloss black on the outskirts which seem to be a lot more durabile and resistant compared to the ascents. I presume the ascents are also coated with a layer of lacquer or polish, but a very thin layer at that as so easily marked, but I may be wrong.
I remember from the workshop photos that all the gloss black trims had blue sticky tape all over them to protect them from scratches
MY17 First Edition - 3L Diesel Td6 - Farallon Black - Roof rails,side steps,tints,tow bar,mudflaps,door strips.
MY18 Hse Luxury - 3L Petrol Si6 Supercharged - Santorini Black - Roof rails,side steps,tints,tow bar,mudflaps,door strips,22's,dynamic pack 1,bonnet vents,t.v,dual view,frontcooler,360°camera,rear cooler/warmer,roof vane,black LR badges,wade sensing,door sill plates,boot liner, solar screen,wind deflectors,service plan,tracker,speed camera detector,dual dash cameras,ceramic coating.