You can try using Apple Guard Leather Conditioner(not the cleaner, it's too harsh) to clean it or Lovinmybags Cleaner. I've only tried the AG one, it works ok, but it doesn't really take out all the dirt. Be sure to test it on a small inconspicuous place first like the back of your mirror to make sure it doesn't darken or change the color of your bag. I know there has been some speculation about linking yellowing and AG use on light colored bags.