Would you happen to work for or have worked for Coach? I saw some of your other posts and it looked as if you were writing in a style that was similar to someone who felt the need to speak for the company.Use the Coach leather moisturizer. It will definitely help clean it up!
The reason I ask is because many of us Coach enthusiasts don't prefer the Coach moisturizer since it contains silicone. Many leather care companies suggest NOT using silicone based products on leather, it not only can breakdown the finish of the leather but clog the pores. I always suggest non-silicone products when possible, ESPECIALLY when we talk about the older and classic styles. I mean we are talking about individuals in this thread who probably are outside of any perceived or coverage period given by Coach to repair anything with their older items. I would not consider the coach moisturizer to be a good cleaner, but even the coach cleaner (and other non-coach cleaners) for leather are known to and can cause loss of color when trying to use them to stain treat or just clean in general.
Now that said, I do use SOME silicone based water protectant products, but since I often use them more on suede than other leather (and in light application) I have less worry about it's harm over long term.