For best results, combine equal parts borax and white table sugar. Dust the mixture any place you've seen roach activity. When the roaches consume the borax, it will dehydrate them and kill them rapidly.
Boric acid: Used correctly, boric acid is one of the most effective roach killers. It's odorless, has low toxicity to pets, and since it isn't repellent to roaches, they will not seek to avoid it, crawling through it repeatedly until it kills them.
Roach Repellents
Peppermint oil, cedarwood oil, and cypress oil are essential oils that effectively keep cockroaches at bay. Additionally, these insects hate the smell of crushed bay leaves and steer clear of coffee grounds. If you want to try a natural way to kill them, combine powdered sugar and boric acid.
Cayenne, Garlic, and Onion Powder
Walk around your home and sprinkle all cockroach-prone areas with this spice mixture. Cockroaches can't stand the smell of these spices and will avoid all areas sprinkled with them.
It's a fact that cockroaches are afraid of humans and other mammals or animals that are bigger than them. They see us as predators and that fear triggers their instinct to scatter away. However, they dislike strong and distinctive scents such as citrus, peppermint, lavender and vinegar.
Mix sugar and baking soda in a bowl. You could also add to a jar, put the lid on, and shake. That way you have it for easy storage. Pour homemade cockroach killer directly onto the floor wherever you've seen roaches, or pour some into a shallow pan and place on the floor.
Distilled vinegar does not kill or repel roaches, making it completely ineffective. Distilled vinegar will help keep your kitchen clean, giving cockroaches less to snack on. However, roaches can live for months at a time without any food at all, and they will eat almost anything to survive.
Baking soda and sugar
You can try this method to eliminate the producers of the eggs. In a small container (or a bottle), make a mixture of equal parts baking soda and sugar. Sprinkle it at places where you've seen cockroaches. This is one of the easiest roach killers.
A concoction of baking soda and sugar is an effective cockroach killer and controls the multiplication of these pests. Sugar acts as a bait to attract cockroaches and the baking soda kills them. You just need to identify their hideouts and sprinkle this mixture in those corners.
The Presence Of Food
Available food is the single most powerful reason cockroaches enter our homes. These insects aren't picky eaters—almost anything left out on your kitchen counters is fair game to them, and they'll be drawn to it.
Water and Soap Spray — A simple mixture of water and dish soap will dry the roaches out, killing them. Mix equal parts into a spray bottle and have at it! Lay Down Eggshells — it may sound a bit odd, but cockroaches are repelled by eggshells, too. Place some inside the cabinets and this should stop them from entering.
How can I get rid of roaches fast? The best way to get rid of roaches fast is to sanitize your home, eliminate hiding spots and stagnant water, store food in airtight containers, and use glue strips, bait, boric acid, or liquid concentrates.
This is one of the reasons peanut butter is often used as a bait. A common homemade remedy in getting rid of cockroaches is peanut butter mixed with borax in hopes that the cockroaches will eat it and die off in time. Peanut butter itself will not kill roaches but the boric acid is known to kill them if ingested.
In the center of the box place a food item (like a banana peel). Open the box lid at night to allow the cockroaches to get in and close it in the morning. This way the cockroaches that got in will die.
Roaches are also hard to kill. But bringing it straightforward, “Rubbing Alcohol can come in handy for killing Roaches.”
The soap doesn't kill roaches. Cockroaches eat soap as it contains fat, so it's clearly not toxic to them. Mix the soap with water, use it in a spray bottle, and properly coat each roach with the substance.
There are a couple of options when using coffee grounds as a DIY solution for cockroaches. One is to make a trap using a jar, water, and coffee grounds in order to drown them. Another is to sprinkle coffee grounds around your home to repel them.
Does Cinnamon repel cockroaches? No, cinnamon doesn't repel cockroaches. But there're are other essential oils or spices that can work against cockroaches. You can use bay leaves, garlic, and catnip to reduce some amount of cockroach activity in your home.
The most popular and effective natural cockroach killer is diatomaceous earth. It is non-toxic to humans and kills roaches when they come into contact with it. Sprinkle the diatomaceous earth around areas where roaches travel and frequent.
Why Do Flying Cockroaches Fly Toward You? If you think flying cockroaches are flying right toward you, they actually aren't. Most cockroach species aren't good "flyers," and what you take as them flying toward you is actually just them being startled and gliding uncontrollably in a certain direction.
Flies are the most common and dirtiest of the restaurant pests. These small bugs can carry billions of harmful microorganisms, including E. coli and Salmonella, which can lead to serious illnesses in humans.
Citrus. You may love the smell of fresh citrus, but cockroaches hate the scent. That means you can use citrus scented cleaners in your kitchen and bathroom to chase any lingering roaches away. You can also keep a few citrus peels around your home in strategic places.