Will Bleach Kill Drain Flies? | Drain Fly Killer Remedies

Will Bleach Kill Drain Flies? If this makes you curious, we have all the answers with some effective Drain Fly Killer Remedies for you!

Drain flies, while not harmful, can become an unwelcome annoyance in your home. In this informative guide, we will explore—Will Bleach Kill Drain Flies? and reveal other Drain Fly Killer Remedies to eradicate these pesky intruders for good!

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What Causes Drain Flies?


The primary cause of drain fly infestations is the presence of decaying organic matter, such as food debris, hair, and slimy biofilm, which accumulates in drains, pipes, and other moist areas. These conditions create an ideal breeding ground for drain flies, providing both sustenance and shelter for their larvae.

Common sites for infestations include sinks, bathtubs, shower drains, and even seldom-used toilets. In some cases, drain flies may also originate from outdoor sources, such as sewers or septic systems, making their way into homes through gaps in window screens or poorly sealed doors.

Do Drain Flies Bite?

Drain flies, also known as sewer flies or moth flies, are small insects that may become a nuisance in your home. Despite their bothersome presence, you may feel relieved that these insects don’t bite humans due to the lack of the necessary mouthparts to puncture the skin and feed on blood, as some other insects do.

Instead, drain flies feed on organic matter and decaying materials found in drains, sewage systems, and damp environments. Although they do not pose a direct threat, their presence can indicate unsanitary conditions and potential issues with your plumbing system.

It is essential to address drain fly infestations to maintain a clean and healthy living space.

Will Bleach Kill Drain Flies?

If you are wondering—Will Bleach Kill Drain Flies? Yes, It does.

However, bleach may not be the ultimate solution, as it doesn’t effectively target their eggs and larvae. This limitation arises because bleach tends to flow rapidly through the drain, not allowing enough time to break down the build-up where eggs and larvae reside.

To enhance the effectiveness of your drain fly control efforts, consider using a combination of methods. Regularly cleaning and maintaining your drains is crucial for preventing infestations. By adopting a comprehensive approach, you can better combat drain flies and protect your home from future invasions.

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How to Kill Drain Flies With Bleach?


Bleach serves as a powerful disinfectant for various surfaces and can be used effectively to combat drain fly infestations. Follow this simple yet efficient hack to rid your drains of these pesky insects:

  • First, pour a bucket of boiling water down the affected drain to loosen any organic material.
  • Create a potent solution by mixing one part of non-chlorine bleach with five parts of water in a container.
  • Carefully pour this mixture into the drain, allowing it to work its magic overnight.
  • In the morning, flush the drain with hot water to wash away any remaining drain flies and their breeding grounds.

While this method is typically successful after the first attempt, it’s advisable to repeat the process to ensure complete eradication of the drain fly infestation. By taking these steps, you can maintain a clean, fly-free environment in your home.


  • Always don protective gear such as a face mask and gloves when working with chemicals.
  • Opt for non-chlorine bleach, as chlorine-based products can pose harm to both humans and the environment.

Drain Fly Killer Remedies

1. Baking Soda, Salt, and Vinegar Solution

Mix four tablespoons of salt, 1/4 cup of baking soda, and 1/2 cup of vinegar in a container to create a powerful cleaning solution. Pour this mixture down the drain, and let it sit undisturbed overnight.

The following day, flush the drain thoroughly with boiling water to remove any lingering debris. For optimal results, repeat this process two or three times per week, ensuring a clean and well-maintained drain.

2. Boiling Hot Water

One of the easiest and most effective methods involves pouring boiling water down the affected drain multiple times a day for a week.

It is a straightforward method to get rid of these annoying drain flies without burning a hole in your pocket or getting in contact with harmful chemicals.

By using this hack, you can say goodbye to fuzzy drain flies and enjoy a clean and hygienic environment in your home.

3. Borax and Sugar Solution

Mix 1/4 cup of borax with 1/4 cup of sugar and pour the mixture down the drain. Add enough hot water to dissolve the mixture and let it sit for a few hours before flushing it out with hot water.

Borax is a natural mineral that has insecticidal properties. When mixed with sugar, it will attract drain flies and kill them when ingested.

4. Baking Soda and Salt

Mix 1/2 cup of salt with 1/2 cup of baking soda and pour the mixture down the drain. Let it sit for a few hours before flushing it out with hot water.

Salt is a natural abrasive that can help to scrub away grime and buildup in drains. When combined with baking soda, which is a natural deodorizer, it can help to eliminate the source of drain fly infestations.

How to Prevent Drain Flies?

In addition to using the mentioned remedies, there are several preventive measures you can take to keep pesky drain flies at bay in your home.

  • Clean your home’s drains using either homemade cleaning solutions or chemical cleaners. This will help to keep the drains free of buildup and debris that can attract drain flies.
  • Eliminate any stagnant water on surfaces or in pipes, as this can be a major cause of moth fly infestations. Regularly removing any standing water from your home will help to prevent drain flies from laying eggs and breeding in the moisture.
  • Cover drains are seldom used to further prevent drain flies from entering and breeding.

Learn How to Unclog a Bathtub Drain with Bleach here

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