I like using the armor all leather wipes. I wipe them on and then after a few minutes wipe the seats off with a clean rag. It doesn't make them slippery or shiny. I've used them on my Cobra, Silverado and my wife's Durango and they work pretty well and are easy to use.
Good question. I used Maguires wipes on my GT, but my butt couldnt stay in the seat for a week after.
Any leather cleaner will do , but do not clean the suede with nothing but a clean damp cloth. That's what I was told by an "expert"