Ghost spray against child fear
In which nursery were not ghosts in the evening? Fill a disused spray bottle with water and a few drops of perfume and decorate the bottle with any asterisks, sticky beads, flowers o. Ä.
When the frightening ghosts appear, spray some of the ghost water into the room and under the bed (most sit there ...) and the ghosts will disappear.
Maybe you still think up some magical spell, then everything will work so well again.
You can do it the other way around and say that this spray attracts the good that drive the bad ones away.
I wish you a good night.