Rubber wheel arches.

Has anyone used a product on their wheel arches to bring them back to black? I'd prefer the rigid arches and spray them but am stuck with these which have faded to a metal flack grey effect. I'm just after something that will give them a shiny black finish to match the rest of the trim.

gtechniq c4

Heat gun and coconut oil. Heat gun works a treat blending out the UV grey plastic surface...plenty of videos on YouTube, just don't heat one place for too long. Once done, wipe over with coconut oil, leave for a good 10 mins then wipe off any excess. Works on all plastic types and they'll look like new...