I have a small coffee stain on my Edith bag. Normally, I wouldn't care, but the bag is white and the stain is super-noticeable (even my boyfriend, who wouldn't notice if I came home with green hair, noticed). The stain is pretty old - from the summer (running to work with coffee and a white bag is not a good idea). Is there anything I can do to lighten or remove the stain? Also, are there any products I can put on my bag to avoid it staining in the future? Thanks!