Does anyone have any idea how to CLEAN it? I have the LV Mini Monogram Juliette with the natural strap. It was one of the first bags to come out when this fabric was introduced in 2002. I love the bag and I don't want to get rid of it because it's impossible to get a hold of now-I imagine it will be somewhat of a collector's piece for LV lovers-but the fabric gets so FILTHY. I asked the SA at my local LV, but they were totally clueless. Anyone?