...o.o If they really are fruit flies, I recommend fly tape above the microwave. They'll swarm to it. Fruit flies are attracted to sweet and sticky stuff. Rotting fruit, vinegar, honey, juice, wine, etc. You can also get a bottle, fill it a tiny bit with vinegar, and then pour a tiny bit of olive oil inside . Make sure it has a thin neck. The flies will fly down because they smell the vinegar and then get stuck in the oil. They're a huge nuisance in the summer over here, so I'm used to getting rid of them.
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~Lu