Why should you pour salt down the drain at night? Jack Slater. Published November 23, 2020 4:00am Updated November 24, 2020 3:40pm Share ... Don’t put coffee beans down the drain.

The good news is that you can eliminate pesky drain flies using items and products you probably already have in your house. For instance, salt, baking soda, vinegar, hot water, a pan, and a cup.