Does Soapy Water Kill Roaches? How to Use It Effectively?

You might have stumbled upon mentions of a simple remedy, but have you ever wondered, “Does soapy water kill roaches?

Dive into this blog to discover the science behind this age-old method, its effectiveness, and how it could become your go-to cockroach combat strategy.

does soapy water kill roaches
Does Soapy Water Kill Roaches? How to Use It Effectively?

1. Does Soapy Water Kill Cockroaches? 

Yes, Soapy water can be used as a home remedy to kill cockroaches by suffocating them.

The soap and water mixture can remove the protective coating and block the breathing holes of the roaches, causing them to die.

Some people also add vinegar to the soapy water to make it more effective and repel the roaches. However, it is not a reliable way to get rid of a cockroach infestation, as it requires spraying each roach individually.

2. How to kill cockroaches with Soapy Water?

If you want to repel and kill roaches at the same time, may make a mixture of vinegar and soapy water as follows:

  1. Get a clean container with 2 cups of water.
  2. Add about 8 teaspoons of liquid soap.
  3. You may also use powdered soap and add 6 teaspoons.
  4. Add ¼ cup of white vinegar into the solution and gently stir to mix so that it does not foam excessively.
  5. Add this in a spray bottle and spray it directly on the roaches generously to kill them fast.
  6. You may also use this to spray their hideouts if you want to flush them out.

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3. How to use dawn soap to kill cockroaches?

Dawn soap is another good way of killing roaches because it also contains sodium chloride that works well in drowning roaches when combined with other soap properties.

This will drain the cockroach very fast and kill them in a matter of minutes.

  1. Add ½ cup of dawn dish soap in a spray bottle
  2. Add 1 cup of water and gently shake to mix
  3. Generously spray this directly on the cockroaches

You can also make a solution of dawn dish soap and water so that you have a good amount of soapy water in a bucket. You may draw the cockroaches in this solution and they will definitely die. You may also use this to wipe out their eggs with a damp cloth.

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Does soapy water kill roaches

4. Can Soapy Water kill Cockroach Eggs?

If you are wondering how to kill cockroach eggs, you might think that soapy water can help. However, this is not enough to get rid of them.

Cockroach eggs have a hard outer cover that protects them from water and other substances.

You will have to break this cover first before spraying soapy water on the eggs. Otherwise, they will not die and they will hatch into more roaches.

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5. Drawbacks of Using Soap Water in Killing Cockroaches

  • Not 100% Effective: While soap water has its benefits, it’s not a guaranteed solution. Roaches are persistent and can find other sources of moisture to rehydrate, which might help them survive the soap water. 
  • Can’t Reach Roaches in Hiding: One big challenge with soap water is that it can’t get into the hiding spots where roaches like to hang out, like cracks and crevices. So, while it might deal with the roaches you can see, it might not solve the whole infestation problem. 
  • Takes Time: Using soap water takes some preparation, especially if you’re using bar soaps. If you have a widespread roach problem, you might need to make multiple batches, which can be time-consuming. 


The question of whether soapy water kills roaches has a promising answer. While it might not work for every infestation, it’s an eco-friendly, cost-effective, and safe way to deal with these unwanted pests. 

For more tips and expert advice on pest control, be sure to explore other articles at Pestweek.

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