Shieldtox Cockroach Spray effectively kills cockroaches Directions for Use: Off-label use is an offence under the Pesticides Act 1974. For mosquito control in the room: Close all doors and windows. Switch on the lights before spraying. Spray Shieldtox 8-H Nights upwards throughout the room for about 2-3 seconds for a medium size room of 60m3. Leave the room after spraying and keep the doors and windows closed for at least 10 minutes before re-entry. Ensure the room is properly ventilate