Ok. I discovered a pen mark on the side of my fuschia chevre birkin more than a week ago. Showed it to my SA who told me that it can be easily refurbished. So, no worries. I figure, I'll wait a year or two (the bag is less than 2 months old) and bring it to Claude in NY for cleaning. Then, on Friday as I was driving home, I found a long (about 3-4 cms) dark mark on the flap. Whoa! Where did that come from? I rubbed it with my fingers, damp towel but no dice - nothing happened! (Imagine how distracting it was, having just discovered the dark mark and driving with the bag in question on the passenger seat!) When I got home, I decided to "experiment" and took one of those Mr. Clean Magic Eraser (the white sponge). Put a teeny bit of water on one corner and started rubbing. I used the damp side and then the dry side to erase and voila - the PEN MARKS were gone!!! I felt the areas where I "erased" and though it felt a little "matty" I figure with time and use and the natural oils from my hands will make it shiny again. It was risky and is not meant for the faint hearted. But I clean my own bags often using Meltonian or Saphir creme and when I have accidents - like that one time I inadvertently swabbed navy blue creme on the linen portion of an H bag (OOOPS!) - I just bring them to Claude clean up after my mess! Bag came back like NEW! (Whew!) Am not sure the magic eraser will work on box but am sure that since it worked on chevre, it will work on togo or clemance. Unfortunately or fortunately, I don't have actual experience to report on these leathers.... (knock on wood...) P.S. And I didn't remember to take photos of before and after (I should have) to show you the results.