Advion Cockroach bait arenas and Gel bait is a great cockroach killer it can be used indoors or outdoors applied as a crack and crevice insecticide treatment . The glue boards are used to monitor cockroach activity. One of the most common questions asked is How to get rid of cockroaches. I have found Advion to be an highly effective tool for solving cockroach infestation problems. Dupont advion is by far the best way to kill cockroaches. No other cockroach spray is as effective.