Speaking of striped lining, did you have any issues with wet leather bleeding onto it? My wristlet was black, not BT like yours, and an ugly blackish-blue border appeared where the leather meets the liner. I didn't even dunk it - only cleaned the lining with gentle baby wipes, trying not to get the leather wet (it did, though). The extremely dirty striped lining improved, but that black border was just getting worse while the leather was drying. It was such huge turnoff, I pushed the wristlet to the back of my closet and haven't touched it since.
So, the question for people who successfully washed 65th anniversary bags: how did you make it work?