I don't have any trouble with my white bags but I am extra careful with them. My rules are pretty much the same as Bichon Lovers, I carry on my arm and never ever sit it down in questionable places. I've even requested an additional seat at dinner for my favorite bags.
Actually I hate my Off White Drummed Leather Riki but I think that was a one time thing with the drummed leather. My SA they had tons of complaints about the yellowing. It's the only JC bag that I've had yellow, it yellowed so evenly that it looks like a butter colored bag. All of my other light bags still look great.
I'm curious too! What is your purse holder Bichon Lover?
My DH is my purse holder!