I had a tenant midnight move on me and leave a place totally gross. All the drains had flies.
We made apple cider vinegar traps that worked well. Basically just apple cider vinegar in a bowl with some dish soap. Then cover with plastic wrap and poke holes. They can get in but not out, and when they touch the vinegar the soap means they drown.
Combine that with constantly cleaning the drains and you should get them. I'd do baking soda/white vinegar treatments on each drain, then boiling water every day.
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