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Does Bleach Kill Cockroaches?

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Updated On

April 12, 2025

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Cockroaches are an all-too-familiar sight, infiltrating our homes and lurking in the most unexpected places. Beneath sinks, inside cupboards, and tucked away in shadowy corners, these resilient creatures seem to thrive, undeterred by our best efforts to evict them.

While their mere presence is enough to elicit shudders of revulsion, the true concern lies in the potential health hazards they pose. Cockroaches are notorious vectors of various diseases, leaving a trail of filth and contamination in their wake.

In the ongoing battle against these unwanted guests, homeowners often seek out alternative solutions, hoping to find a cost-effective yet potent remedy. One such option that usually arises is the use of bleach, a ubiquitous household item with purported insecticidal properties.

But can this common cleaning agent truly vanquish the scourge of cockroaches? As a seasoned professional in the field of pest control, I’ve encountered countless inquiries regarding this unconventional approach, prompting me to delve deeper into the matter and uncover the truth behind this age-old question.


What Compounds Make Bleach?

To determine if bleach can kill cockroaches, let’s look at what it is.

Bleach is a chemical compound that is made by mixing chlorine, water, and caustic soda. Bleach has whitening and anti-microbial properties.

There are many types of bleaches formulated for different types of use. In household application, bleach is used to whiten clothes, sanitize floors and toilet bowls, remove stains, eliminate mold and mildew, and whiten hair. The disinfecting property of bleach is also used in sanitizing pools.

Household bleach can either be in liquid or powdered form.

Bleaching powder or chlorinated lime appears as white powder while sodium hypochlorite, the active ingredient in bleach, is a dilute solution in water with greenish-yellow color. Bleach leaves a strong and unpleasant chemical odor that lingers for a while.

Bleach is considered a pesticide, and was first registered for use as a pesticide in 1957.


Can Bleach Kill Cockroaches?

Yes, bleach can kill cockroaches through ingestion or drowning. However, it is not as potent, safe, or as easy to use as traditional insecticide chemicals specifically intended to kill roaches.

By ingestion, it means that you would have to make cockroaches drink the liquid solution.

Household bleach is commonly used as a cleaning agent and gives off a strong toxic fumes that cockroaches hate. Filth and cleanliness don’t mix at all, which makes the physical act of killing cockroaches with bleach very hard.

Because of this smell, cockroaches will just fly, jump, or scurry away from the trap instead of getting tempted to drink it. Alternatively, your bleach solution can be used as an effective repellent but this wouldn’t solve your roach problem.

Normal roach bait contains other ingredients specially made to attract cockroaches so that they eat the poison-laced into the bait. Bleach is a terrible attractant and would likely do poorly as a roach killer.

Stomping on cockroaches isn’t enough to kill them, since they have an exoskeleton, which is flexible and strong. It’s not like you can even use a spray bottle with bleach tot tackle your roach infestation, as it isn’t enough bleach to submerge the roaches.

Now let’s move on to your second option — drown the cockroach.

The disadvantage of this is that you will have to catch these nasty insects one by one. Bleach is a fairly strong chemical, and it can drown the cockroach in a matter of seconds.

How to Know If You Have an Infestation

Before exploring potential remedies for roach control and to get rid of these household pests, it’s crucial to determine whether you’re truly dealing with a cockroach infestation. These hardy pests are experts at concealment, often remaining hidden from sight until their numbers have reached alarming levels. However, there are telltale signs that can alert you to their presence.

One of the most obvious indicators is spotting live cockroaches scurrying across floors, countertops, or walls, particularly during the night when they are most active. If you encounter these unwelcome guests during the day, it could signify a severe infestation, as they typically prefer to remain in dark, secluded areas.

Another common sign is the discovery of cockroach droppings, which resemble small cylindrical pellets or specks of black pepper. These droppings can be found in kitchen cabinets, pantries, or behind appliances — anywhere these pests frequent in search of food sources and shelter.

Unexplained stains or smears on surfaces, especially in warm, humid areas like bathrooms or laundry rooms, could also indicate the presence of cockroaches. You might even notice speckles on your baseboards from the cockroach droppings. These stains are often caused by body fluids or fecal matter.

Finally, keep an eye out for shed cockroach skins or egg cases, which are small, brown capsules. These findings are a clear indication that cockroaches have established a breeding ground within your home.

If you encounter any of these signs, it’s essential to take swift action to address the infestation before it spirals out of control. While exploring potential remedies like bleach, it’s crucial to understand the extent of the problem and the most effective methods for removing these tenacious pests.


Staying Safe When Using Bleach

Bleach can technically kill cockroaches, but you could argue it poses more of a risk to humans than cockroaches.

Physical Contact With Bleach

Bleach is a highly corrosive chemical. If you work on the chemical without any protective clothing such as gloves, physical contact with bleach can burn your skin, especially if you don’t wash it off immediately. As much as possible, use appropriate tools and protection gears while working on your solution.

Ingestion of Bleach

Bleach is an oxidizing agent. If accidentally ingested by your pet or any member of the family, it is important to immediately provide the victim enough drinking water or milk to dilute the chemical. Bleach can burn the mouth, esophagus, and stomach of the person who drank the solution. Depending on the strength of the solution and amount of the liquid ingested, adverse effects range from vomiting, delirium, coma, and death.

Inhalation of Bleach

As mentioned above, the chemical gives off a strong smell that can linger for a couple of hours. Exposure to this odor may lead to stinging eyes. If you continue working with the chemical while disregarding the importance of wearing a mask, exposure may lead to burning throat, coughing, and difficulty in breathing. It has also been strongly discouraged to mix bleach with Pine-Sol as it can lead to the production of chlorine gas which can be extremely poisonous.

It is best if you can use bleach in a well-ventilated area. Opening the windows in the middle of a Milwaukee, WI, winter or a Las Vegas, NV, summer may not be practical if you intend on using bleach as your pest control home remedy of choice.


What You Should Remember When Using Bleach to Kill Cockroaches

Bleach is technically capable of both repelling and killing cockroaches, but it is much less practical of a solution.

It is only effective in killing cockroaches that you can catch. The most of your population will remain safely hidden in the corners and crevices of your home.

Furthermore, bleach can pose a serious risk to the health of not just yourself but also to your family and pets.

Unless you are willing to strictly observe all of the safety precautions mentioned above, it is strongly recommended to consider other options for removing cockroaches.

Final Thoughts

While I know that bleach may seem like a readily available and inexpensive option for dealing with cockroach infestations, its effectiveness is limited, and its use comes with significant risks. The potent chemical properties that make bleach a powerful cleaning agent also pose dangers to humans, pets, and the environment if not handled with extreme caution.

Trying to kill cockroaches by ingestion or drowning them in bleach is an impractical and potentially hazardous approach. Not only is it challenging to lure these resilient pests into consuming or coming into direct contact with the bleach solution, but the process itself can be time-consuming and laborious.

Moreover, the strong odor and corrosive nature of bleach can lead to adverse health effects, such as skin irritation, respiratory issues, and even severe internal injuries if ingested accidentally. Proper protective equipment and well-ventilated areas are essential when working with bleach, further complicating its use as a cockroach control method.

Rather than risking your safety and failing to address the root cause of the infestation, I advise you to explore proven and effective pest control solutions. Professional exterminators and pest control services have access to specialized products and techniques designed specifically for cockroach elimination, ensuring a comprehensive and safe approach to ridding your home of these unwanted pests.

By considering the limitations and potential dangers of using bleach as a cockroach control method, you can make an informed decision and prioritize the well-being of your family and home environment. Seeking expert assistance or investing in targeted cockroach control products may ultimately prove to be the more reliable and responsible choice.

How to Get Rid of Cockroaches: Frequently Asked Questions

Does bleach kill cockroaches?

Yes, bleach can kill — but it is not the most effective or practical method. Bleach can kill roaches through ingestion or drowning, but it is difficult to get them to ingest it, and drowning them one by one is very labor-intensive.

Does mopping with bleach kill roaches?

Mopping with a bleach solution is unlikely to directly kill cockroaches. While the strong smell of bleach may help repel roaches, it does not effectively remove them. From my experience, cockroaches are experts at avoiding and hiding from potential threats, so they will likely scatter and take shelter rather than come into contact with the bleach while you are mopping.

Is it true that baking soda and sugar can kill cockroaches?

Yes, it is true that a mixture of baking soda and sugar can be an effective homemade cockroach killer. The sugar attracts the roaches, and when they ingest the baking soda, it reacts with the acid in their digestive system and causes them to die of gas buildup.

How does bleach kill roaches?

Bleach can kill cockroaches in two ways: ingestion or drowning. If a cockroach ingests a bleach solution, the corrosive properties of the bleach can damage their internal organs and lead to death. Alternatively, if a cockroach is submerged in a bleach solution, it can drown due to the caustic nature of the chemical.

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Ed Spicer

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Coty Perry is a lawn and garden writer for Today’s Homeowner. He focuses on providing homeowners with actionable tips that relate to the “Average Joe” who is looking to achieve a healthier and greener lawn. When he isn’t writing he can almost always be found coaching youth football or on some trail in Pennsylvania in search of the next greatest fishing hole.
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