Having access to the same pesticides that professional exterminators do doesn't mean you'll automatically get the same results. You may have the tools, but you need to know how to use it properly. Failure to do so will only end up emptying your pockets and worse, allow the roaches to survive and grow resistant to the pesticides. Spray them in the right spots to make sure they die fast. How do you know where the right spots are? I'll cover that here.
Before you jump to any specific areas, you need the do a little observing. Look for signs where that tell you there are many roaches nearby or that many of them move through the area. One sure sign is roach droppings. They're often very small and dark in color (black most of the time). They look almost like coffee grounds.
You can also wait until nighttime to observe where you see them most. Leave the light off for a few hours and come back. Turn on the light quickly and look where most of them are and where they run off to. These areas should be sprayed.
Now to common areas that need to be sprayed. Let's start with the outside first. Spray along the entire perimeter of the house. What we're doing is forming a pesticide barrier. Any cockroaches that come in from the outside will touch the pesticide and likely die. Spray along any potential entrance spots like cracks and vents too.
On the inside of the house, you need to spray under the cabinets and especially along all the baseboards. Door and window trims should be sprayed too. Also look for small cracks and holes where roaches can fit in through and they those spots too.
Spraying in these areas will increase your results. Since the roaches are more likely to walk through these areas, the chances of them touching it and dying from it are much higher. Also remember that you need to reapply these pesticides every month until they are gone.
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