|A cockroach nymp. It will quickly reach adult hood|
and make another 40-50 of them.
Each professional exterminator (or business entity) will have their own unique touch that they add to achieve the results they aim to get. They won't tell you what it is even if you pay them (unless you're a multimillionaire with spare cash to waste). They'll gladly come to service your home for a fee, but they won't disclose their secrets to you. That's not to say they won't offer you tips to help though because I'm sure most of them would be more than happy to help you out. I mean you are helping him/her/them out by giving them business.
Even if you can't uncover their secrets, you can follow what they would generally do when treating a cockroach infestation. Just follow what the generally do and although you won't to get the maximum results like they will, you’ll get it close enough. Close enough is better enough considering we are trying to cut costs out by bypassing the professional exterminator.
Now generally, there are two approaches to control a cockroach infestation. One is the traditional method of just spraying insecticide correctly. The second is called IPM, integrated pests management, where you also spray, but you first work to correct the causes of the infestation. I won’t cover IPM techniques here, but you can read more about it at pestsoff.com
To start, you need to identify the cockroach you are dealing with. With over hundreds of different species of roaches it can seem impossible and intimidating, but it is actually quite easy in most cases. You see this is because of the hundreds of different roaches, only a select few are actually considered house pests. Check out this link for a list of those you need to know of because they're common house pests
Once you know where they might be hiding, you will know where to spray insecticides. The first thing to do is to spray the baseboards of the rooms. For this task, you must use an insecticide that will stay effective for a prolonged period of time. You need to use man and insecticides because they're the only ones that will stay effective up to a month after the Initial spray. Natural stuff will deteriorate within hours after being exposed to light and oxygen.
After spraying the baseboards, you will also need to spray areas where roaches come through frequently. Learning more a bullet the roaches makes these areas easier to identify.
Then you will need to flush out roaches that are hiding in small cracks and spaces you cannot reach. An insecticide spray with a precision straw works great for this. The small straw lets you spray these very tight spaces with precision. You are also able to drill a small hole into the drywall and spray the insecticide into it.
Flushing them out will kill any that directly comes into contact with the initial flush. Any other that run out later will go through the insecticides sprayed first. Those will die as well. Keep in mind that the chemicals need to be sprayed again on a monthly basis. To get a good list of insecticides that the pros use check out this webpage. Now you know how to get rid of roaches without an exterminator.