Unfortunately, there's a good chance you have fungus gnats and not fruit flies. Do they live in houseplants? In my experience fruit flies go away if you rinse cans/bottles, and keep the sinks/drain clean, and use a lid for your compost.
I had some sort of gnat living in the soil of my plants. After I subjectively tried every chemical known to mankind, I got rid of them by ordering a package of egg- or larvae-eating nematodes over the net, mixing them with water and sprinkling them in. Instant success.
Nah it’s definitely fruit flies. Keeping things clean helps but we have kids and it’s hard to keep things clean enough to keep them from coming in. They’re not breeding indoors but they get in frequently and then annoy you.
