We are a new building, but part of our building was a renovation of an existing structure. They've attempted to make it look historically accurate, which I guess somehow included a pretty flat porous paint. Being an elementary school kids are touching the wall, writing on it, drawing on it, all the time. And the wall is white! So far we've used magic erasers to removing the larger pencil and pen marks, but we've got to find a solution to clean these walls regularly. Do you guys have any ideas? Or is our only hope to repaint over the summer?