Recently our house has been overrun with gnats. I followed all your suggestions, nothing worked. I finally called an exterminator, he couldn't come but he told us to pour scalding water down every drain in our house and follow it up with bleach.
They said we may have to do it several times before we can see it is effective. We used 2 gallons of scalding hot water for each drain and followed up with a quart of bleach for each drain. I wanted to pass this along cause it is really a problem this year.
Source: This information came from an exterminator.
Another thing that works and doesn't hurt your plastic pipes or fittings the way bleach can is to mix equal parts of white vinegar and hot water and pour it in the drain. Occasionally throw some lemon slices in your garbage disposal with the peel and grind them up for a deeper cleaning. To get rid of the ones flying around, just take an empty water bottle and put about 1/2 inch of white vinegar in it and leave it with the cap off by the sink. They will fly down into it, drink the vinegar and fall into it. It works really well without the chemicals.
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