I will give a sure shot solution. Get some boric acid and mix it in some atta and make a paste like using water. Spread this paste along the edges and wherever the cockroaches are most active. This will help you a lot. At my home i got pest control done but it did not help. This remedy helped a lot, not a single cockroach now. and don't worry, boric acid is not har,ful, it is very safe!