Killing Gnats with Bleach

Someone told me to pour bleach where gnats are at the most and they will go to the glass and die. I was just wanting to know if it would work or not?


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July 7, 20180 found this helpful

I was told to use a pesticide that kills termites and they will be killed too. It is best if you can find the nest

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July 26, 20180 found this helpful

a good way to kill gnats and fruitflies is to get a spray bottle with rubbing alcohol and just spray them where they are.

also make sure to keep everything as clean and grime and moisture free as humanly possible, especially rubbish bins and drains

the only thing I've heard re bleach is to pour it down the drain to kill the eggs, though I prefer to make a bomb by pouring a cup of baking soda chased with white vinegar and then with a pot full of boiling water. In general I find it's best to avoid bleach as much as possible because fumes

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July 30, 20180 found this helpful

I am assuming the gnats are by your windows...not coming from the sink drains or other locations.


The best way to get rid of them is to get rid of the if it as a bag of old fruit or potatoes or something like that, bag it up and take it outside away from the house.

If that is not the problem, and they are coming from the drains, then, yes, bleach down the drain until they stop coming up should do the trick. I mix a cup of bleach in a bucket of warm water and repeat this over several days. Wear old clothes and gloves so you don't get this splashed on you.

If you can't locate the source, then you can set up a trap and hope that eventually you get them mixing up some dish soap and apple cider vinegar, water and sugar (equal parts water and cider--like 1/2 cup) and a few drops of dish soap--any kind and a tablespoon of sugar. They will go to that, try to eat? drink? and die.

Only use this mixture if you DO NOT have small children and pets around that will get into don't want them ingesting that mixture. BIG BAD YUCK!


I have friends that swear by filling up a bottle with vinegar and water (equal parts) and spraying them to kill them as they fly around...but I am not into my rooms smelling like salad dressing so I haven't tried that one.

Good luck! Those things are PESKY and quite annoying!

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