I have a beautiful vintage Marc Jacobs bag in yoghurt calf leather that I'd like to bring out again this summer. I've had it since 2007 and it's been well used. The leather has a few dark scuff marks that I'd like to try and restore. Is there a colour restorer product anyone can recommend that might bring it back to it's former glory? I've seen a few that are manufactured for leather furniture but say they can also be used on shoes and handbags - are they worth a try?