Ok, so synthetic pesticides are potentially the best roach killer. However great they are, they can't get everything and it still takes time. No matter what you do or choose to use it takes time. That doesn't mean you can't decrease the amount of time it takes to get rid of them completely. Combine your treatments with IGR, insect growth regulators, and reduce the time it takes to kill them off.
What are insect growth regulators? They're exactly as they sound. They prevent roaches from growing up into adults. What they are is man-made cockroach hormones. Just as we have learned to make pesticides imitating these designed by nature to fend off insects, we have discovered how to make the hormones that roaches need to molt into adults.
For a juvenile roach to molt into an adult and achieve reproductive capabilities, it has be completely free of a specific hormone. Using these man-made hormones and exposing the juveniles to them, they will not be able to turn into an adult. Since we are always keeping them exposed to the hormones, they can never be completely free of them. That means less reproducing and results in lower numbers of roaches to deal with.
As great as insect growth regulators sound, don't mistaken them for a pesticide. They are not capable of killing the cockroaches in your home. The only thing they will do is help reduce the numbers from exploding again after your treat it with pesticides properly. You must use IGRs in combination with a pesticide such as boric acid, or cypermethrin (my personal favorite and what I consider to be the best roach killer ever)
Ultimately you are able to kill them all in a shorter amount of time because there are way less roaches that you have to kill. One important thing to remember about IGR is they are ineffective by themselves. They won't kill roaches if used alone. Make sure you spray insecticides as well.
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