I know better than to start projects so late in the day. Having said that...I was using some washable markers earlier. (I know, I know, I know....wash your hands and then wash them again.) There was a smudge left on my thumb which...well, you can imagine. The marker is washable, it is a small smudge, but I don't know what to do. Thought I'd ask, before I made a bigger mistake. Just water & a clean cloth, maybe?