some morrisons window cleaner (for the windows) have a special dashboard spray them wipe, do that on all plastics. hoover the floor and mats then shampoo the mats every few months with APC+ water or carpet shampoo, APC the seatbelts with a brush. Britemax leather conditioner on the seats and steering wheel.
I remove the cubby hole/cup holder under the centre console and the door handles take out the switches and scrub them all with APC then leave to dry and refit every 6 months or so.
Also empty the glovebox and give that a wipe down with a kitchen sponge with a small amount of APC on it, hoover if necessary. Seats get hoovered too.
its late cba with grammar and spelling etc.