Article: Remove the hair catcher or filter from an affected shower drain and clean it out thoroughly, removing all the hair tangled inside it. The key in destroying the drain fly's breeding ground is removing all hair, grime, and debris that the flies might lay their eggs in. Pour 1 to 2 gallons (4 to 8 liters) of warm water into the drain to moisten it slightly. Note that this is only needed if the drain is not used on a regular basis. Drains used on a daily basis are moist enough without taking additional measurements. Work a metal pipe brush into the drain, extending it as far down into the drain as possible. Twist the brush while slowly moving it up and down to remove grime from the sides of the pipe. Insert a plumbing snake into the drain and twist it through the pipes to pull out clumps of grime that lie further down. Apply roughly 4 oz (125 ml) of the cleaner around the edge of the drain.  Applying the cleaner to the edge of the drain allows it to coat the sides of the drain and pipe as it glides down. Gel cleaners are formulated to remove organic matter. You could also use enzyme or bacterial drain cleaners to remove organic material.  Vinegar, boiling water, and bleach are traditional remedies for getting rid of drain flies, but many experts insist that these methods are not effective.  Baking soda and vinegar poured down the drain may kill the flies; it will clean the drain at least. You may need to repeat the same dosage of drain cleaner once a day for five to seven days total. After the drain cleaner has sat in the sink for several hours, flush it through with plenty of water. Use a plunger to remove any remaining organic matter trapped in the sink.
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Clean the hair catcher, if applicable. Moisten the drain, if necessary. Use a metal pipe brush. Fish out other grime with a plumbing snake. Pour a gel drain cleaner into the drain. Finish up with a plunger.