Ok, kinda attempted to answer my own q! I asked the BV store about this problem and the SA said that if the bag is plain white and there is colour transference, they send it to Italy and it is dry cleaned beautifully. If it is off-white or pink etc, there is not much they can do. He claimed (and his colleague supported this too) that jeans, esp dark indigo and black are the main culprits as Bagpuss said and suede is another problem material. Whilst I was there, I also talked this lady who was browsing into buying a large dark chocolate veneta. They should put me on commission! Mind you, if I am to get a meaningful employee discount, it is totally worth leaving the finance world for!