Do a search on Drain Flies. They live and breed in the inside of your drains in the scum and sludge that builds up there. In our old house, the bathroom sink where we brushed our teeth got them a few times. Take the drain plug out, get a long bottle cleaning brush, give it a good scrub, then pour lots of boiling water down the drain. I can't remember if we used insecticide or anything but I don't think so.
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