Read this article in some blog, found it useful or I'm re-posting it here.
Below are the steps on how you can clean your Coach collection :-
Cleaning leather on Coach bags, wristlets, purses or swingpacks
1.Avoid using the washing machine
2.Make sure you buy Coach Cleaner from any Coach retail outlet or you could order Leather Cleaner / Conditioner here which should be just as good.
3.Grab a clean, soft cloth (try avoiding cloths which are coarse) and apply a small amount of the cleaner on to the cloth.
4.Gently rub the cleaner on to the leather in circular motions
5.Once you have covered the entire bag with the cleaner, wipe off all existing leftovers from the cleaner and leave the bag to dry for at 30 minutes.
6.Get another cloth which is dry and clean, repeat step 4 and step 5.
7.Leave the bag again to dry and you should be done.