If you want to get rid of drain flies, but don't understand where did drain (sewer) flies come from, first you need to check some places: kitchen drains, sink drains, garbage cans etc. — they may attract drain flies. But don't worry, if you try to eliminate them by yourself – and it doesn't work as a result. We have made the list of 6 things which help you kill drain flies without spending a lot of money.