Final Verdict. The Combat Roach Killing Bait is our top choice among roach killers. It's inexpensive and easy to use—just place the bait stations on surfaces and in corners where you have seen insects lurking or suspect they might have been.
The best roach killer, based on our research, is the advion 383920 Cockroach Gel Bait; a commercial-grade roach killer set that is easy to use and lasts months after application. It can kill all sorts of cockroaches, including the American and German variety, and it's even safe to use if you have pets or kids.
Boric Acid
For best results, dust a little bit of this powder in corners and floors and let it sit while roaches come in contact with it and die. Boric acid is not effective when it is wet. A word of caution – this powder is poisonous and should be kept out of reach of children and pets at all times.
The most common materials and methods exterminators use to perform cockroach extermination are gel bait insecticides, fumigation, boric acid, hydramethylnon, and fipronil.
Home remedies like diatomaceous earth, baking soda, boric acid, citrus, essential oils, and borax can be effective ways to get rid of roaches. If you want to take a more aggressive approach to eliminate roaches, glue traps, bait stations, and liquid roach deterrent concentrates are all excellent options.
However, this is a process that can take several weeks. There are different factors that affect how long it takes cockroaches to die after treatment. The species of roach involved makes a difference. For example, it can take up to five weeks to completely rid your property of German cockroaches following treatment.
In that scenario, you can buy what are called desiccant dusts—like diatomaceous earth, a non-toxic substance you can find on Amazon—and that will dehydrate the eggs, thereby killing them.
Pine-Sol and Fabuloso are strong, all-purpose household cleaners. Similar to bleach, these products kill roaches on contact. Some homeowners suggest spraying Pine-Sol around the outside of your house to keep cockroaches away. Others claim it repels flying insects, such as wasps.
Does borax kill roaches instantly? A roach that steps in borax won't die instantly. Instead, they'll go back to their hiding place before eating the borax dust their legs picked up. You might not see the dead bugs lying around out in the open but you should notice a drop in their numbers in a week or two.
Smells that roaches hate: a quickfire summary
Oregano, rosemary, mint, eucalyptus, lemongrass and catnip are great herby options. Citrus oils work brilliantly too. And surprisingly, lower concentrations – 2.5 parts per hundred – seem to work best as deterrents. Just don't bother with lavender.
Citronella
Citronella not only works great for repelling mosquitos but also cockroaches. While the candles don't work well against roaches, you can use citronella oil as a deterrent. You can mix it with water and use it as a spray or simply wipe down areas with the diluted mixture.
It's not an instant killer like harmful chemicals. Yet, it's worth putting to good use when they can kill those pests slowly, but surely. Be sure to put baking soda to good use with other mixtures. Sugar and baking soda will be the perfect mixture to kill cockroaches.
Raid Max Cockroach Baits Traps, six pack
Using these Raid cockroach traps are one of the more common ways to trap and kill the creepy crawlies. The pack comes with six child-resistant baits to place around the house and can last for up to three months, helping you keep your infestation at bay.
Boric acid is a powerful natural home remedy for getting rid of roaches overnight. Mix equal amounts of boric acid, flour, and sugar until it becomes a dough-like consistency. Place small pieces where the roaches can feed on them.
Create a soapy water solution that you can spray with a bottle. It will only take about 2 – 3 sprays to kill any roaches, as the soapy solution will cover their breathing pores and suffocate them.
All About Vinegar
Unfortunately, it doesn't actually kill these problem insects. It's more of a cleaning tool than anything else, and it won't actually help eliminate your roach problem. It can, however, help deter roaches and get rid of germs in the kitchen when used as a cleaning agent.
Cockroaches have a strong sense of smell. Using natural scents works best to deter roaches. Plants such as eucalyptus, lavender, and mint are smells roaches hate.
Sprinkle the diatomaceous earth around areas where roaches travel and frequent. The sharp particles of diatomaceous earth damage the waxy, protective exoskeleton of the roach, causing it to dehydrate and die, typically within 48 hours of contact.
Unfortunately, bleach is a very ineffective method for killing cockroaches. It has a very strong smell, so it doesn't work as bait, and cockroaches won't willingly go to it. The only real way to kill a roach with bleach is to drown it, and there are much more effective ways of killing cockroaches.
Cockroaches are not truly social insects (like honey bees or termites). As such, they do not have a queen. However, they are considered 'gregarious' and tend to congregate during rest times (generally the daytime).
Squishing a cockroach releases it's eggs: Fake
As it sits, the protein substance surrounding the egg case hardens, protecting the eggs inside. One ootheca can have anywhere from 10-50 eggs inside, depending on the species.
With an exoskeleton of overlapping plates connected via a stretchy membrane, their bodies are extremely flexible and their legs are fast making cockroaches hard to kill. Their speed allows them to squeeze into the tiniest cracks and crevices and to crawl away quickly as soon as a foe is detected.
It's also common to see more roaches even. This is because your pest company has sprayed their normal hiding places with pesticides, making them inhospitable to the roaches. As a result, the roaches will scramble to find new hiding spots and die off because they've already been exposed to the pesticides.