Trap Drain Flies with Apple Cider Vinegar Place one or more of these traps near the problematic drains. The drain flies are attracted to the sweet-smelling vinegar and will go through the small holes to get the vinegar. They won’t be able to escape back through the plastic wrap.

What causes drain flies? Stagnant pools of water, particularly in pipes and other drainage areas, attract drain flies. These small, gnat-like insects feed on and breed in sewage. Organic material can build up along the side of drains quickly, welcoming drain flies to eat and reproduce.

Pour in 1/2 cup of salt and 1/2 cup of baking soda plus a cup of white vinegar. Allow it to work its magic overnight then flush the drain with hot or boiling water the next morning. This will sanitize the drain and kill the flies and their eggs.

Can an exterminator get rid of drain flies? Yes, they can get rid of them in basic situations. However, they may not be equipped to help you if the problem lies with a broken sewer line or buildup deep inside your main lines.

To kill any gnats together with their eggs and larvae, you can use ammonia in drains where they are living. Just pour a small amount of ammonia into the sink. This will successfully get rid of all traces of the gnats.

Pour hydrogen peroxide in the drain. It will foam up when it reacts to the bacteria in the drain, and it will kill adult flies/gnats as well as their eggs.

Does Rubbing Alcohol Kill Drain Flies? Using alcohol for eradicating drain flies is not a bad idea either. Once you locate the drains where they breed, you need to make sure the sink hasn’t been used for a few hours. Then, get a bottle of 90% rubbing alcohol and just pour some of it down the drain.

Solution: Let the soil dry out for a few days so the top two inches are dry. Then, mix one part hydrogen peroxide (regular %3) with four parts water, and water your plants as you normally would. The solution will kill fungus fly larvae on contact, but it won’t harm your plants.