Mcguiars interior detailer for the vinyl and plastic, Mcguiars leather cleaner and conditioner for the seats. Works great! Been using it for years on all my family's vehicles and many friends. Everyone is amazed at how well it cleans everything up and makes it shine.
Are you only looking at doing the interior or the exterior as well? If you want some easy do it yourself polishing products check out the thread I started on polishing my truck.