Have you tried using a steamer? Leather is porous (it used to be skin) and maybe the steamer will help "open" it up and allow you to get the cleaner a bit deeper. Also, chatted with a friend about this very thing a while back and he explained that the leather seats a much like paint in that...
Hey Guys and Gals,
Just a quick hello from the great Pacific Northwest! I've been doing a ton of reading and watching everything I can find on detailing and thought I'd join all you AutoGeeks and see how the pros are doing things out there. I'm just a weekend warrior who has always enjoyed...