Not that you need any advice or help with the cleaning as it’s come up amazingly but I used williams waterless wash and wax on the interior plastics of the gt. (I use it on the exterior of the transporter and fabia as they are both black). It really helped to restore a deep shine back in to the plastics. For all fabric related stuff I use a vax carpet cleaner which has some funky swirly brush head attachment.
Anyway, looks spot on, love the special seats and wheel! I wonder if they originally came with specific mats?
This might be controversial but I think it’d look great on a set of black deep dish alloys or even mildly banded steelies