Yes, you can treat cockroaches with chemical pesticides. However, chemical pesticides are designed in a general form. Therefore, the solution may become harsh on mild pest infestation and sometimes the chemical can become slow on heavy pest infestations. As a result, the desired result can not be achieved through the treatments. That is why one must hire a professional cockroach exterminator and let the experts treat the cockroach infestation with the needed methods. Also, the expert can arrange the best chemical given to the basis of cockroach infestations.