For eg. Name tags to hang on the door of the children use toothpaste. The ordinary white toothpaste (without streaks or gel) in tiny little drops on the board (or one drop if it is a small sign),hold it for a while. Then you let it go and it is fixed after drying. To get off the seesaw you off there as weather, wet cloth over it and the weather is nice and fresh and clean without leaving a hole behind.