The $15 gel that finally killed my drain flies. They breed in the gunk in your pipe walls, which is why boiling water and bleach do nothing.
I lived with what I thought were fruit flies for four months. I threw out produce, took out the trash, cleaned the counters, nothing changed. They were drain flies, and they actually live IN the drain, breeding in the gunk that builds up on the pipe walls. Pouring boiling water down does basically nothing, and bleach does nothing because they live in the slime above the water line.
The thing that actually works is an enzyme drain gel, it eats the gunk they breed in. I poured it down before bed and repeated it the next two nights. Gone in three days.
If they hover right around the drain and keep coming back after you clean the kitchen, they're drain flies breeding in the pipe.
Three nights of the enzyme gel cleared mine completely.
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