that deerskin campana must be beautiful. the cleaning of the day to day dirt sounds like a good idea for any bag.I bought a white large deerskin Campana in good used condition this summer and I love it.
I bought it used for a good price exactly because of the concerns here--I didn't want to spend a small fortune on a white bag that I would be afraid to use because of getting it dirty. The bag is slightly scuffed on two edges and the handles show some wear, but otherwise it's in good shape. No yellowing that i can see.
I've been carrying it several times a week all summer and getting lots of compliments on it. I don't exactly baby it. Perhaps because it's so large (so much wonderful white leather!), it doesn't seem to show soil easily. I've been following the same directions for it as I received for our leather furniture: wipe it with a slightly damp cloth now and then to take off surface dust/dirt; our customer service person said that surface dirt is what can wear into the leather eventually and make it discolor and look "dirty." So far it's working and I love the bag.