How can you get rid of drain flies?

Myfivecents
by Myfivecents
Drain flies hatch somewhere in a houses drainage pipes and killing the ones that come out of the drain pipe doesn't get rid of them. They just keep on hatching in the pipes and then flying out. Will a good foaming pipe cleaner get rid of them or is there something else that will work that isn't so toxic? I've looked up information online and they make some good suggestions but I would rather use natural non toxic ingredients to get rid of them.

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