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How Long Does It Take for Borax To Kill Roaches?

How Long Does It Take For Borax To Kill Roaches?

Cockroaches are a common and unwelcome sight in many homes.

They can be difficult to eradicate somehow, but luckily borax is a convenient and effective means of eliminating them.

But the question remains- how long does it take for borax to kill roaches?

In this article, we will explore different factors that influence how quickly borax can kill cockroaches and provide step-by-step instructions on how to apply it correctly.


Borax has long been used as an effective, economical, and safe way to get rid of roaches.

In addition, its insecticidal properties make it a popular choice for homeowners seeking to rid their residences of these pests.

But how long does it take for borax to kill roaches? The answer is not definitive, but several factors can affect the length of time required for borax to be fully effective against roaches.

The next section of the article will explain why borax kills roaches and how borax mixtures are used to kill roaches. After that, a summary will be followed by frequently asked questions.

Why Does Borax Kills Roaches?

Why Does Borax Kills Roaches?

Borax is a naturally occurring mineral composed of sodium, boron, oxygen, and water. It’s commonly found in laundry detergent, deodorant, and other household products. Now, it’s gaining attention for its use in killing roaches.

Borax works by dehydrating the cockroaches when ingested or inhaled. The borate molecules bind to the body fluid in the roach’s exoskeletons, causing their cells to lose water. This ultimately causes death due to dehydration and starvation.

In addition, boric acid or borax is toxic for insects because its particles irritate their respiratory systems. When applied as dust on surfaces, borax will stick to their bodies and cause even more nuisance when they come into contact with it.

When using borax to kill roaches, homeowners should wear gloves and protective eyewear before applying the powder around their home’s baseboards or other areas where roaches may be present.

How Long Does Borax Take To Kill Roaches?

How Long Does Borax Take To Kill Roaches?

Borax is a powerful and effective way to kill roaches, but how long does the process take?

Borax is a natural insecticide that works on crawling and flying insects, so it works well on bugs. When borax is used properly, it can quickly eliminate an infestation.

Borax typically takes about two weeks to remove roaches from your home completely. However, many people notice results in as little as one week.

One of the main benefits of using borax is that it works gradually over time rather than killing all the roaches at once.

This gives the insecticide time to spread throughout the nest and work between cracks and crevices where pests hide out during treatment periods.

Additionally, this slow effect discourages further infestations since dead pests cab is a warning sign for other insects in their colony.

6 Ways To Use Borax To Kill Roaches

Ways To Use Borax To Kill Roaches

Using borax effectively kills cockroaches, but there are safety considerations to keep in mind.

However, this homemade solution can be used with minimal risk of harm if you follow the right steps.


No one, especially children, should ever ingest borax. It can cause serious health issues if consumed.

However, When properly applied and used according to instructions, borax can be a safe and effective insecticide for the home without harming your family or pets.

Below are some ways to safely use borax as a cockroach killer and yield maximum results:

1. Borax With Suger

Borax With Suger

Borax with sugar is one of the most common strategies. It’s a quick and easy solution that requires little effort but can yield big results.

So how long will it take to kill roaches?

The answer depends on very few factors, including how much borax and sugar you use, how accessible the spots where you put the mixture are to roaches, and more.

  • Mix sugar and borax in equal quantities.
  • Now spread a thin layer where you see a lot of roaches.
  • Borax may take some time to impact, but it will.
  • Roaches will likely die in hidden spaces rather than out in the open.

Generally speaking, if cockroaches ingest enough of the toxic mix, they will die in as little as 48 hours.

However, it could take longer if they don’t have access to certain areas or don’t consume a lethal amount of poison.

2. Borax and Baking Soda

Borax And Baking Soda

Borax and baking soda have become increasingly popular for killing cockroaches and other pests. To use this solution:

  • Mix borax and baking soda to form a white powder.
  • Add an attractant such as sugar.
  • Sprinkle it and wait for it to take effect.
  • Reapply the mixture as needed.

Generally, You can expect a roach population to show signs of decline within 48-72 hours after applying borax.

In addition, while it may take several weeks before your infestation is completely gone, any future eggs laid by remaining adults should be affected immediately after contact with the power.

3. Borax and Peanut Butter

Borax And Peanut Butter

This natural insecticide can be effective in just two or three days when combined with peanut butter.

Borax is a naturally occurring mineral used as an insecticide since the early 1900s. It acts as both a stomach poison and a desiccant, meaning that when ingested by roaches, it kills them from the inside out.

  • Put a spoonful of peanut butter on a plastic lid.
  • Sprinkle borax on top.
  • The roaches will be drawn to the lump of peanut butter and will eat it, consuming the borax you sprinkled on top.

For the best result, use regular creamy peanut butter spread directly onto cardboard or paper plates and mix the borax into it-around one tablespoon per small plate should do the trick!

4. Borax and Egg Yolk

Borax And Egg Yolk

Egg yolks are a versatile ingredient used to create various recipes.

With the addition of borax, you can take your egg yolk-based dishes to the next level.

To make an egg yolk-based mixture, you will need just two ingredients:

  • 1/4 teaspoon of borax.
  • Mixed it with one raw egg yolk.

It will take almost two weeks for the paste to work its magic and eradicate roaches from your home.

5. Borax and Cocoa Powder

Borax And Cocoa Powder

Cocoa powder is a great way to bait roaches. It’s sweet and irresistible to them, plus it mixes well with borax powder, a popular roach killer.

  • Take an equal portion of cocoa powder and borax.
  • Mix them in a plastic container with an airtight lid.
  • Sprinkling the mixture where you often see roaches.
  • The cocoa powder should attract the roaches even if you’re slightly off the placement.

However, most exterminators report that within one to three weeks after application, you should start seeing dead or dying roaches due to consuming the mixture.

Therefore, to maximize success rates, it’s important to ensure all creases and nooks are covered with an even application of the mix throughout your home.

6. Borax With Boric Acid

Borax With Boric Acid

Making boric acid crystals with borax is an easy, effective way to make a homemade insecticide.

Not only can the borax help eliminate roaches, but it can also work as an ant killer.

In addition, boric acid crystals are organic and safe for use around people and pets, making them a great choice for controlling insect pests in the home.

  • When combined with hydrochloric acid, commonly known as muriatic acid, borax forms a powerful and long-lasting insecticide.
  • Although this mixture may initially seem intimidating, it is easy and affordable to make at home.
Be Careful

It’s important to use the utmost caution when working with both borax and hydrochloric acid, as these chemicals can be harmful when not handled correctly.

Most experts agree that it typically takes two to three weeks of consistent exposure before large roaches begin dying off.


Borax is a great option to use against roaches effectively and economically.

However, it’s important to understand that borax does not kill roaches instantly, and it can take several weeks to notice the full effects.

Therefore, The best way to use borax is an integrated pest management program that includes other methods, such as trapping and applying liquid insecticides.

Frequently Asked Questions

Does Borax Kill Roach Eggs?

Borax does not affect eggs immediately upon contact; It will quickly kill any nymphs that hatch from them. It is also effective for years with proper application and maintenance.

Applying correctly and consistently can eliminate infestations from your home or business.

How Do You Spread Borax to Roaches?

Simply mix one part of borax and one part of sugar; pour the mixture into a squeezable bottle and dust the areas where you’ve seen roaches.

A powered sugar dispenser or similar container will also work if you can spread a light dusting.

Does Salt Kill Roaches?

No. If you plan to use common table salt to kill roaches, it can happen only in your dreams; Otherwise, it is ineffective again for roaches. The salt spray does not repel roaches.

How Long Will It Take Borax To Kill Roaches?

The time required for borax to effectively eradicate roaches depends on several factors, such as the amount of borax applied and the size of the infestation. However, it may take up to three days to kill the roach.

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