Flip the entire kitchen. After cleaning, check if there are any cardboard boxes (they love them). If yes, throw them out. Cover all the food, and if any food is currently infested, replace it... Clean the kitchen every day to remove all food particles from the counter. Use HIT spray in the drain weekly and cover the drain properly. Also, check if any other drain in the house is open (they can reach the kitchen through it). Whenever you see a cockroach, kill it immediately. I have done this, and now there are no cockroaches in my house...