hmmm...anyone know if bingo markers are water soluble? Or am I going to have to take a blasting gun to the wall to get this stuff off? Any help? I looked on the marker, but it has nothing helpful, not even a website to read information. And I've tried googling it, but I'm obviously not finding the right stuff. It's blue bingo marker that slung out onto a tan siding. It looks awful and I'm sure my boss will call it graffiti. So, help?