American cockroaches can move from one building to the next during the summer, entering through cracks in foundations, around loose-fitting doors or windows, and along water and gas pipes. Seal openings with putty or plastic wood. Inspect sacks, cartons and boxes, etc., brought into the home and destroy any roaches.
Clean up spilled foods and liquids, avoid leaving scraps of food on unwashed dishes and countertops, store food in tightly sealed containers, and rinse cans and bottles before putting them in the trash.
Proper hygiene and sanitation are essential, forcing the cockroaches to travel further to find food and water, which increases the chances of contacting treated surfaces outside harborage areas. Remove food and water sources for roaches by practicing good sanitation, vacuuming daily, keeping food in tightly sealed containers, and removing standing water wherever possible.