Does Bleach Kill Cockroaches? Scientists Weigh In

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Bleach is a popular choice for do-it-yourselfers looking to get rid of pests in their home. But Does Bleach Kill Cockroaches?

Bleach is not always an effective solution, as cockroaches and other pests have become resistant to bleach.

It is important to know that bleach may be effective in killing some types of insects. However, it is not highly suited for use against roaches, especially when there is a better alternative option present. Roaches are hardy and can survive in environments where other types of insects cannot.

Having said that, if you still want to use bleach to kill cockroaches, know that it is not an entirely lost cause. Let us find out more about it.

Signs of a Roach Infestation

spider roaches insects

Roaches are a common household insect, with some of the most common signs being fecal matter and eggshells. Roaches can also leave droppings on surfaces, including walls, floors, and countertops.

Cockroaches are attracted to things like garbage, leaky pipes, and left-out food. They can also be found in dark and moist places, such as basements and crawlspaces. If you sight a cockroach, it is likely that there is an infestation.

Once inside, cockroaches make their presence known with unpleasant smells and, oftentimes, stains. Cockroaches are also known to carry diseases, so it is important to address an infestation as soon as you notice any signs.

Does bleach kill cockroaches?

largest web water beetle tommy

When you spot a cockroach, your initial reaction might be to reach for the bleach. But does bleach kill roaches?

Bleach, unfortunately, is an extremely useless way to kill cockroaches. It has a strong odor, so it won’t act as bait, and cockroaches won’t go near it willingly. The only efficient way to kill a roach with bleach is to drown it, and there are numerous other ways to do that.

Bleach is also quite corrosive, and it can rapidly harm any surface it comes into contact with. It also doesn’t stick to roaches, so they won’t consume it or distribute it to other cockroaches while grooming.

German roaches

Does bleach kill german roaches?

Yes, bleach can kill German roaches. In fact, bleach is one of the most effective methods for killing these pests. German roaches are very sensitive to chemicals and can be killed by even a small amount of bleach. However, it is important to use caution when using this substance, as it can be harmful to humans and pets if not used properly.

Does Bleach Keep Cockroaches Away?

photo stainless steel giant pet

Bleach may be effective in cleaning surfaces, but it is not an effective insecticide. Roaches are resistant to the effects of bleach and can survive after coming into contact with it.

There are many other homemade insecticides that are more effective than oxygen bleach and can be used to keep cockroaches away.

Need Direct Contact

In order to kill roaches with bleach, you must expose them directly to the bleach for a prolonged period of time.

Roaches will not die if they only come into contact with the fumes from the bleach. It is necessary to remember that bleach is a dangerous chemical and should be handled with caution.

Bleach is effective in killing the roaches that you can see, but it can be difficult to get to all of them. Roaches are typically more active when humans aren’t around, so you may need to do a few rounds of treatment or use a different method in addition to bleach.

Has A Potent Smell

Bleach is a powerful cleaner that has a potent smell. This smell can help to deter roaches and other pests from entering an area. It is necessary to use caution when using bleach as it can be harmful if ingested.

The smell of bleach is potent, and it appears that cockroaches avoid it. This means that if you are trying to get rid of an infestation, traps will not work. You need to spray the bleach directly on the roaches.


Bleach is a corrosive substance and can harm objects around the house. This includes metal surfaces, as well as other porous surfaces like wood or drywall. It’s important to be careful when using bleach and to avoid contact with your skin and eyes.

Bleach Will Damage Fabrics

does bleach kill cockroaches

Bleach is a powerful and effective cleaner. However, it can also be damaging to fabrics. It can corrode the fabric and cause it to become discolored or weakened.

If you are putting bleach to use in order to clean an item made of fabric, be sure to test it in a standalone area first to make sure that the bleach will not damage the fabric.

There is a good chance that bleach will damage your fabrics because bleach contains harsh chemicals that can strip the color from clothes and other materials.

In addition to that, bleach is a powerful oxidizer, and it will cause the fabric to fade, wrinkle, or become brittle. So if you are looking to bid goodbye to roaches using bleach, be aware that this method may not be as effective as you think it would be, and your clothes could be damaged in the process.

Bleach Can Harm People Or Pets

Bleach is a cleaning agent that can kill pests such as cockroaches. However, it is important to be aware of the potential dangers that bleach poses to both people and pets.

Bleach is toxic and can cause respiratory problems, the chemicals in bleach are corrosive and can damage skin and eyes, and if ingested, bleach can be deadly.

Does Bleach Repel Roaches?

Bleach can be an effective tool for killing cockroaches if used in the correct manner. However, the smell of bleach may not be enough to repel roaches completely.

You may need to acquire other methods in consonance with bleach to get rid of roaches for good.

Kill Roaches Using Bleach

Professional exterminator in protective workwear spraying pesticide in apartment kitchen.

Bleach is a powerful household cleaner and pesticide. It has anti-microbial and disinfecting properties, which make it an ideal choice for getting rid of cockroaches.

In addition, there are five ways bleach can be used to kill or repel cockroaches. Bleach can be sprayed directly on cockroaches, added to bait traps, mixed with water and used as a mist, poured down the drain and left overnight, or sprayed around the outside of your home.

Remember that bleach should only be used by experienced individuals, as it has the potential to cause harm if not done correctly.

Let us discuss in depth the five most suitable ways of using bleach.

Making Cockroaches Ingest Bleach

If you are capable of making cockroaches ingest bleach, it will effectively kill them. It’s no surprise that bleach may kill cockroaches; if consumed, bleach is incredibly toxic.

Consumption of bleach solution may appear to be a simple technique to eliminate cockroaches. The harsh odor of bleach, on the other hand, makes it difficult to get cockroaches to ingest it.

Cockroaches will not be attracted to a cup of bleach left in your kitchen. These pests may not fall for the trap even if you soak some breadcrumbs or other food items in household bleach.

This strategy can assist in keeping cockroaches out of your house, and while it will kill them, getting them to consume bleach is challenging!

Using Bleach to Sanitize your Home

Using bleach to clean and sterilize your home can help you avoid a cockroach infestation. Cockroaches are particularly poisonous to chlorine, which is found in bleach.

Cockroaches will not tolerate the intense scent of bleach and will flee if you use it to clean your home.

Bleach solutions can be made by combining bleach with water and other detergents. Clean your kitchen counters and other surfaces prone to infestation with this solution. The solution can also be used to clean floors and other non-corrosion-prone areas.

Cockroaches will flee from the scent of bleach because it is so strong.

Drowning Cockroaches in Bleach

If you can’t get the roaches to eat bleach, you could drown them in bleach. You could, for example, toss the roaches into a bleach-filled container anytime you see them.

The problem with this, though, is that you can only kill roaches when you come across them. If you’ve ever dealt with cockroaches, you’re well aware of their ability to find hideouts.

When you turn on the lights, these smart creatures flee to their hiding places. This procedure may only kill a few roaches while leaving hundreds more hidden in the house.

Cockroaches running around the home can be caught with clips or paper towels and thrown into the chlorine bleach solution. This task, though, might be demanding. This strategy may not be appropriate if you don’t want to deal with cockroaches.

If you don’t mind picking up this pest or catching it, it’s a good idea. One roach does not necessarily indicate that your home is contaminated, but it could be the beginning!

Spraying Cockroaches with Bleach

When you spot roaches moving around the house, put bleach in a spray bottle and spray them. More cockroaches will be killed by spraying than by ingesting or drowning.

However, if you employ the bleach spray method, you may not be able to reach all of the cockroaches in your home.

When you spray bleach on cockroaches, it may stain many objects that come into contact with it, including carpets. So be cautious!

Destroy Cockroach Nests

Bleach is an immensely effective way to get rid of cockroach nests. Pour a cup of bleach into the pipes, and it will kill the roaches instantly. Make sure to use gloves and protective eyewear when handling bleach.

It is essential to be careful when using bleach and to take the necessary precautions. Pour three cups of water into the pipes after using bleach to help rinse them out and prevent corrosion.

What are the Drawbacks of using bleach to kill roaches?

The German cockroach (Blattella germanica)

Bleach is a popular choice for people looking to get rid of cockroaches, but there are some drawbacks to using it. One is that it can be difficult to use as an insecticide—you need a sprayer in order for the bleach to reach the cockroaches.

Another is that cockroaches have to drink it in order for it to kill them, so they may move away from areas where you have sprayed bleach before it has time to take effect.

In addition to that, Cockroaches can hold their breath for a long time, and they can also survive in water. If you do not have a direct hit on the roach, it will likely escape and rebuild its population in your home over time.


In short, bleach is effective in killing cockroaches; however, it is important to keep in mind that it is a harsh chemical and is something that should not be ingested. It is also important to take necessary precautions when using bleach as it can be harmful if not used properly.

It is necessary to follow the instructions carefully to avoid exposure to the toxin. Bleach should not be ingested. It is an effective way to get rid of cockroaches, but it should be used as a last resort.

When using bleach to kill cockroaches, make sure to use it in a well-ventilated area. Cockroaches are repelled by the fumes of bleach and will die if they come into contact with it.

About the author

A biotechnologist by profession and a passionate pest researcher. I have been one of those people who used to run away from cockroaches and rats due to their pesky features, but then we all get that turn in life when we have to face something.