Rat extermination is not as simple a process as roach rat exterminator or ant control is. For roaches and ants you can simply spray pesticide and they will be controlled. But it is not so in the case of rats. For rats you will need to adopt a completely diverse approach. Unlike roaches and ants, rats can smell the various dangers around them. They will use every tactic to avoid the various pesticides and sprays, to stay alive. To effectively carry out the rat extermination, you will need to use various do it yourself pest control methods.