This is slightly OT but maybe it will help you. I just emailed Chanel to ask them how to care for my white Cabas and this was their reply:
Thank you for your inquiry regarding care for your CHANEL handbag. If
you would like to maintain the original condition of your bag, we
recommend the following:
-- Maintain the line of the handbag by not overloading it.
-- Do not expose the leather to sun or moisture.
-- Protect the handbag from contact with makeup or perfume.
-- Light-colour patent leather should not be placed adjacent to
dark-coloured materials for long periods of time. Small leather items
are especially at risk for such migration.
-- If the product is wet, dab it dry with a natural-coloured, absorbent,
non-fluffy cloth. DO NOT RUB.
-- When you are not using the bag, store it in its protective bag,
preferably upright. Ideally, line it with tissue paper and place the
chain straps inside so that they don't mark the leather.
-- Sprinkle a grease stain with talcum powder, let it sit for a few
minutes and then gently dust it off with a soft, clean makeup brush.
-- We do not recommend any cleaners or sealing products for our bags.
-- Polish your bag with a soft, dry cloth of fine, knitted wool. Use a
light-coloured cloth to avoid any transference of colour.
-- To remove or obscure any slight scratches, rub the surface in a
circular motion with a clean, dry finger.
