I noticed recently that on the back side of one of my wristlets, there is a dark spot, maybe a little smaller than a dime. I can not for the life of me figure out how it got there; nothing leaked in my bag, there was no stain anywhere else. At least its on the back of the wristlet, but its still really bugging me. Id like to use this wristlet w/my Whiskey Ali (its a british tan wristlet from my outlet trip last year). I tried the Coach leather cleaner but it didnt budge. Anyone have any suggestions? Thanks much!