This is the windowsill over my kitchen sink, at least part of it. There are a couple more pots to the right and left of those you see, but what I want you to notice is the little white dish with the blue flower. It's a death trap.
It's the time of year for fruit flies but we've also been subject to a small plague of fungus gnats. Here with the potted plants I'm pretty sure it's fungus gnats.They don't rise up in great clouds when I water the plants, but a few do, and they're extremely annoying and almost impossible to eradicate completely - insecticidal soap and trying not to overwater both help some. But this old school remedy, which was originally thought up for fruit flies, has made a big difference. The white dish contains apple cider vinegar and a few drops of dish soap. The tiny bugs are attracted to the vinegar, and once they land on it, the dish soap keeps them from flying out again.