Mix together 1/2 cup of salt, 1/2 cup baking soda and 1 cup of vinegar. Pour the mixture down the drain. Let sit overnight, then flush the drain with hot water in the morning. This should kill all flies and the organic material they've been feeding on.
Most exterminators use chemical methods and habitat modification to kill all eggs, larvae, and adult drain flies (removing food sources, etc.).
One common remedy for killing drain flies is using household bleach. This is a very useful and cost-effective manner for getting rid of these little pests with an item you already have around the house.
What Causes Drain Flies? Drain flies thrive in stagnant and standing water. Common sources include slow or clogged drains, rarely used and unused toilets, refrigerator drain pans, and standing water created by leaking pipes. They typically enter buildings through basements, windows, and drains.
Besides inadequate control measures, another reason why you have drain flies present again could be because there was a secondary infestation in another site that was not discovered or treated. There may be other bathroom drains, or a floor drain, laundry room drain, or sump pump that are breeding flies.
Baking Soda, Boiling Water & Vinegar
The pour half a cup of bicarb soda down the sink as well, followed by a half cup of white vinegar. Let it settle for a few minutes then poor some more boiling water down the drain. Follows these steps every few days until the drain flies have completely disappeared.
Preventative Maintenance
Pouring bleach into the drain when the unit is not operating can leave residual bleach, which will damage the drain pan and line. Using vinegar for preventative maintenance throughout the year will keep your drain clean and clear and will not damage your line.
They do not bite, sting, or spread diseases, but their decaying bodies may cause allergic reactions. They can also spread bacteria from trash, decaying vegetables and fruits. Drain flies breed in areas that are moist and have a lot of organic remains, including: Sinks.
Essential oils are sometimes used to keep flies away from infested sections and also to kill them. Lavender, eucalyptus, peppermint, lemongrass, and citronella are just a few of the scents that insects despise (with lavender probably being the most effective).
Drain flies gather, mate, and lay eggs in moisture or standing water. The slimy film that forms in sewers and drains is a favorite breeding spot. Putting off regular cleaning and maintenance of these areas may attract the pests and offer them a place to feed and develop.
Pouring boiling water is quite risky as it might lead to a steam burn or scalding. Another thing to keep in mind is what type of material you are pouring in into. If you have a porcelain sink, it is likely to crack due to the heat. All in all, pouring boiling water down your drain will only cause issues down the road.
What if The Baking Soda & Vinegar Hack Doesn't Work? If your drain doesn't unclog right away, repeat the baking soda & vinegar process another time or two. If you have a stubborn clog, sometimes the baking soda & vinegar trick just doesn't work. You may have to use a sink plunger to help push through the blockage.
With time, baking soda and vinegar may work as a natural drain cleaner on weaker drain clogs, and the benefits of regular drain cleaning can help keep your drains free of clogs. But for tough drain clogs that need to be dissolved right away, you may want to use a stronger drain cleaner, like Liquid-Plumr.
Using Hydrogen Peroxide on a Clogged Drain
Hydrogen peroxide dissolves organic matter to loosen and flush away debris such as skin cells. It also disinfects the drain as it works by reducing germs inside your pipes and making your sinks smell fresh and clean.
Apple cider vinegar and Dawn work great for the killing part, while sugar will attract them. If you have a big house fly problem, the milk jug fly trap works well.
Using white vinegar as fly repellent is a great if you're in a pinch. Add it to a spray bottle alongside dish soap, water, and baking soda for a surprisingly effective treatment.
The larval stage of drain flies lasts up to 24 days, while the pupal stage lasts between 1 and 2 days at most. The larvae feed on bacteria, fungi, and other microorganisms that develop in the breeding medium in drains, standing water, and even sewage treatment beds.
Nine times out of ten, a drain fly problem will go away on its own. Once you get rid of the drain flies that you see, start flushing toilets and running the water in your sinks. This eliminates the standing water in which they dwell.
The black or brown flies/moths you see in your drain are most likely “drain flies” that live on decomposing, organic matter in your drains, which explains why they hang out near sinks or showers. These flies are also referred to as: Moth flies. Filter flies.
Salt & hot water
While hot water can help loosen up debris, coarse salt actually scours the inside of your pipes, removing more material than hot water alone. After removing standing water from the sink, pour about half a cup of table salt down the drain before you pour in the hot water.