Combat Max® Roach Killing Gel formula attracts roaches with the food and water they need. Combat Max® Roach Killing Gel starts killing both large and small roaches within a matter of hours. As a form fitting substance, Combat Max® Roach Killing Gel is best used in cracks and crevices where roaches enter the facility. Kills both large and small cockroaches and can be used indoors or outdoors. Place baits throughout your facility, so more roaches can find and eat the bait, resulting in a quicker and more thorough kill.