This Purple Window Marker is for use on clean, dry surface only. Do not use on car body, paint, wood, clothing or any other non-glass surface. To use: Shake Window Marker well and then pull off cap. Press marker sponge tip against window and squeeze gently to start flow. Allow Window Marker to dry for about 10 minutes. To remove: Sponge off with soap and warm water. Warning: Choking Hazard - small parts. Not for children under 3 years.