Slightly clueless S&B question! I have several nice lighter-coloured crossbody bags that have ended up with indelible blue smudges on the back from dark denim jeans, even ones that have been washed a few times (the jeans, not the bags). At the moment my solution is to only use my black bag if I'm wearing dark jeans without a long coat to protect the bag, but I have a really nice tan leather bag that basically never gets seen for large chunks of the year and I'd like to use it more. Does anyone know of any magic protector that repels denim stains? Or should I start a fad of wearing a large muslin cloth tucked apron-style into my belt as a bag protector?