I have had a dark brown leather (untreated) living room set for just under a week and my daughter got at the chesterfield with a dark blue Sharpie. After reading many posts on this forum I decided to try Off Kids Skintastic bug spray. After trying it on the bottom of the couch I was satisfied that it would not ruin the leather. Immediately after spraying it on the effected area I could see the difference. The color started to wash away easily. For larger marks I had to spray twice, but it all came off. It's amazing, I can't even tell it was there.
Before you try any home remedies, always test in an inconspicuous area. You never know what could happen. Most things can be washed out, even though it says permanent. ... View related article.