This came up last year on the JX forum. I have the same problem with my car and you have to keep up on it especially if you are wearing blue jeans. I've been using a leather cleaner from Griots (Car Interior Detailing - Griot's Garage). I use a leather cleaner and leather protectant. They both seem to work well, but I think if you don't keep onto of it, it will be hard to get blue jeans color stains out completely.
There are a lot of of good commercial products out there, but I personally like Griots since their headquarters are in Tacoma. They offer detailing classes for free. They did tell me to really protect light colored leather early on rather than later.
There are a lot of of good commercial products out there, but I personally like Griots since their headquarters are in Tacoma. They offer detailing classes for free. They did tell me to really protect light colored leather early on rather than later.