Hey guys, this is a great question and one that I can help with. I owned (and worked) for my own detailing company for 8 years and I tried hundreds of products. The best stuff for your interior panels is something that leaves it looking like it just left the factory (meaning no shine), and something with UV protection. Meguiars makes the best stuff I have ever used to clean, protect and leave a pleasant (but very subtle) smell on interior panels.
They have two items that do this:
1) Meguiars Quick Interior Detailer - can be found at most auto stores, comes in a black bottle.
http://www.autodetailingsolutions.net/g13616.html
or
2) Meguiars Detailer line Quick Interior Detailer
http://www.autodetailingsolutions.net/m ... 32-oz.html
Personally, the consumer line (#1) smells better, but does get expensive.
For Leather, hands down Lexol PH Cleaner followed by Lexol Conditioner is the absolute best. Again, no greasy shine, leather looks fresh from the factory.
Hope this helps!
Brad