What about using Woolite carpet stain remover? I know it sounds weird but I used to use it on my fabric Coach bags and it worked very well. Spot test it first though just to make sure and don't rub or scrub. (I never used it on an LV) Pat with a white towel.
I have a mini Lin Noelie in blue. I don't use her much in the winter so one spring I took her out and she had orange colored "stuff" near the bottom piece of leather on the fabric. I took hot water and a little bit of vinegar. Remember that vinegar bring the PH back to neutral but be careful how much you use. With light scrubbing and time, I was able to get all this "stuff" off.