My suggestion for an interior detailer would be poor boy's natural look. It's relatively cheap and will last a long time. It gives me the nice matte look that I like for the interior. You can also get the shiny look if you apply more product. You can pretty much use it on anything in the interior and even some exterior, minus the windows.
Also, it doesn't make the interior oily.
Heres a link for more info on it.
Poorboy's Natural Look Dressing
