No dry-erase markers in the house? Then try spraying ... written on a whiteboard with a Sharpie instead of a dry-erase marker? It is such an easy mistake, especially if you are not paying attention.
Odds are you have a bottle or two of hand sanitizer lying around the house, which makes it a convenient ... of hairspray to have a quick and easy Sharpie remover! Just make sure to keep it off ...