For eliminating the drain flies ... clean the drains and kill the eggs, larvae and any adult flies". Mr Chadwick continued: "Others will recommend mixing baking soda and vinegar together, with ...

After some time, pour boiling water down the drain to flush it, eliminating both the clog and the flies. Apple cider vinegar traps can also be effective at luring and killing adult drain flies ...

There are many aerosol pesticide sprays on the market for flying insects, but these will only kill active drain flies. If you choose to use them, you must find products that are marked safe to use ...