Best overall: Ortho Home Defense Insect Killer - See at Amazon Best contact spray: Raid Ant & Roach Killer Insecticide Spray - See at Amazon Best gel: Advion Cockroach Gel Bait - See at Amazon ...

But if you want the best possible ... what's attracting roaches to your home, how they're getting in, and where they're hiding. And they apply insecticides in the form of spray, powder, or bait ...