The writing was on the wall. I wasn't particularly pleased with it being there, either. It happens from time to time in daycare and the best way I have found to manage it is to have my buddy (who happened to be my grandson this time) clean it up. I don't say much, just that writing doesn't belong on the walls and that it needed to be cleaned. I hand over a scrubber and maybe a little soap. Sometimes it's easy to clean and sometimes it's not but it's ALWAYS a good learning experience. It's almost never as much fun cleaning the writing off the wall as it was putting it there. The few times when it IS as much fun? Well, then I will happily hand over scrubbers and cleaning cloths for the whole group and have a clean up party. Win/win!