I would definitely not use any type of Armorall type dressing on the interior. i made this mistake with a previous BMW. The shiny stuff looked good but was a dirt magnet and a bitch to remove. I am presently using Griots interior wipes followed by Griots vinyl and rubber dressing. It is Ok and seems to provide protection without attracting lots of dirt. There may be something better out there but this has been a good starting point.