Hey guys so ive been using my beaubourg tote in damier ebene and I actually noticed that there is this white stain on the interior fabric of the bag, I honestly have no idea what caused it, I was thinking that because of the bag being open all the time. I tried wiping with a damp clothe but didnt work, have you guys experienced the same issue or heard of some? What recommendations could you give? Or is it even repairable. Thanks in advance !