If you have an ongoing pest problem, or an infestation, it is best to hire an exterminator to curb the infestation once and for all. Not only cockroaches, there might be a beehive on the balcony, red ants or flying ants, termites and other forms of pests might forage in YOUR house / commercial seeking for food and shelter. It is important to take immediate action against these pests as these grow rapidly and spread across the house. The task should be laid upon qualified and trained exterminators as conventional pest control methods involve use of toxic chemicals to eliminate pest, the use of which can be extremely hazardous to your health.