Hi all-- I've got a purse dilemma... is there anyone out there who can help? I have a large white Guess bag. I think the style is Sicily, but I'm not positive. It's made of a canvas-like material. Recently I noticed a few black stains on the side of the purse. Can anyone give me some advice on how to remove these stains? I'm not sure where they came from, but I do know that it is not ink. I'm guessing that the bag brushed up against something dirty without my knowledge. Thanks in advance!