I had this problem after the flood from hurricane Harvey last year. All these work but I got Catchmaster Bug and Fly Clear Window Fly Traps, they are the best thing ever! I put them in windows, near bright lights and places like around the sink and trash cans. We had so many gnats it was impossible to have any food or lights on, it drove me mad. I reccomend buying the big pack on Amazon you get 12 packs for about $25usd.
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