The used treatment method and time to get rid of cockroaches will vary depending on the infested area and level of infestation.
Managing cockroaches is not easy. The first thing to do is to determine where the roaches are located. The more hiding places are located and managed, the more successful the control program will be.
Some locations may be difficult to get to. Reduction of food and water sources and hiding places is essential. If cockroaches have access to food, baits (which are a primary control tool) have limited effect and sprays alone will not eliminate cockroaches.
Although sprays may provide a quick, temporary knockdown of cockroaches, they do not give long-term control. They might just disperse cockroaches to other areas of the building from which they may return later. Also, some cockroaches have become resistant to many insecticides that formerly controlled them, Organic pesticides can be used for this kind of treatment.
In Case of an American cockroach infestation, spraying inside drainage manholes is a must, since its the perfect breeding place for them
Preventive measures are the key to successful control. It is easier to prevent a cockroach invasion than to control an established population. The success of preventive measures requires care, Planning and sustained the effort. Cleanliness in the home and elimination of favorable breeding sites lessens the possibility of cockroach infestations and reduces the need for pesticides, but these practices will not always prevent invasions from outside sources.