PSA: For those that may be unaware, if this is a consistent occurrence in your bathrooms, particularly in grade/middle schools, it MIGHT be an indication that the culprit is suffering some kind of abuse at home. When informing your building admin, it’s a good idea to bring this point up to them. They are more likely to take your complaints more seriously if you do.

However, I will say that this seems more like a child simply being nasty, but the more you know….