Tiny Flies in Your Bathroom? Here’s What They Really Mean—and How to Get Rid of Them

Inside pipes, a slimy layer called biofilm can accumulate from hair, soap residue, bacteria, and other organic debris. Drain flies lay their eggs in this material, where their larvae develop.

That means killing the adult flies alone usually won’t solve the problem. Sprays may reduce the visible insects temporarily, but new adults can continue emerging continue reading …