There is a foam spray I use, just put on and wipe off and it cleans the door inserts and seat sides perfectly! The rub from the black seatbelts, just use a rubber (not a condom!) and make sure it's a new one, and the marks come right off.
As I have mentioned, I have OCD when cleaning my cars and clean each one at least 3 times a week....and keep a paint brush to clean the dash when sat at traffic lights!
Am heading to Zurich, and then south to the Alps, a few passes I want to drive along, and then to Milan and maybe Verona, and then back......
Please no blasts at me for saying this, but before the Z came, I looked very hard at a year old AMV8, in white again, and the lease payments were frightening, hence the Z, and even now, i think I made the right choice in terms of looks - I adore how it looks, especially in white and roof up. It's probably the prettiest car I've had, with the RRS being the most handsome car!