How To Kill Water Bugs In Drains. A super simple fix is to pour boiling water down the drain to eliminate drain flies. Another easy option uses baking soda:
Baking soda and vinegar poured down the drain may kill. Be careful not to completely cover the drain.
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Boric acid works in 2 ways to kill off bugs infesting your home. Check the tape the next morning for any insects that have become stuck in attempting to exit your drains.