Avoid leather cleaners & conditioners. They cause the leather to relax, become supple and look very used.
For the seats: A damp cloth with a little bit of a mild, natural soap (like Ivory or baby shampoo). Rinse with a second wiping of a clean, damp cloth.
Dashboard, door panels and console: damp cloth ONLY. This leather is specially dried to allow it to be pulled flat & tight. Any kind of conditioner will cause it to stretch ... you'll end up with wrinkles in the leather.
Not true, you just want to use the RIGHT cleaner and conditioner. Using soap and water over time will actually dry out the leather (soap will break down the oil and remove it). Leatherique has a different approach where you condition the leather and in the process clean it by forcing dirt and impurities out of the leather with the conditioner taking it's place. You don't actually "clean" it with the Pristine Clean until the 2nd step where you are really just removing the dirt that has been pushed to the surface.
We use Leatherique products exclusively on all of our office chair conversions and it's amazing what the Pristine Clean and Rejuvinator does to the appearence of your leather. No BS, it works. we recently became a distributor of the products since it's been the only thing we endorse to our customers. Some times we have a customer send us one of their seats froma wrecked car for an office chair conversion and the car is covered in dirt, soot, water, mud, etc. Sometimes they find the seat themselves at a junkyard and ask us to make a chair for them (we have a flat fee for this), we've been able to bring seats back to like new condition from a condition a normal person would have conisdered it trash. Google the brand and you'll see countless endorsements from Ferrari, RR, Bentley, Lambo, Maser, and historic restorers and owners.
Also, keep in mind most of your interior is vinyl. On your dash, only the center "t" portion facing your is leather, and on your seats, only the front surface is leather (sides and back are vinyl). The Leatherique products are ok to use on vinyl as well as it does a great job at cleaning. Use twice a year for normal use.