You cannot deny it. They are disgusting, germ carrying pests that are a danger to you and your family. Roaches lives in any places that are wet, dry or dark, no matter where they are they can live anywhere no matter the environment, but the most common place that you all know where they love to stay and be a nuisance is the home of all human beings. You see, like any other living organism, roaches needed food to eat and they all attract to humans delicious substances. Whatever they can find they will surely sneak in to your kitchen and steal a crumb or two for their breakfast, lunch and dinner. It has become an annoyance to you and that is why you needed the best roach killer you can find.
There are a lot of things that you can use for killing those insects but each of them can bring a slow and painful death to them, or immediate kill. Whatever method you choose it will kill they all off in time. If you want a fast and immediate slaughter then you need roach bait for it. Usually the poison gel are perfect for the job. Especially when you want to kill the whole flock by sending in an infective to their base of operation. If you prefer something natural where you can find in your killing supplies, boric acid is the number one winner for the job. Boric acid kills them slowly in a painful way. They are fast and effective.
It depends which of them is the best roach killer for you to use, because each of them are the best in their own way. They are also affordable and easy to find, you can just go and check the hardware store for it and you have you roach killing weapon ready. In about a week you will be clean free from them.