The main reason these insects enter homes is related to the accumulation of debris inside the drains. Often, a damp layer composed of soap residue, hair, sebum, and dirt forms inside the pipes. This environment becomes the ideal breeding ground for the flies to lay their eggs.
For this reason, even if the bathroom looks spotless on the outside, the problem might be hidden inside the drainage system. The most common causes include dirty pipes, standing water, hair buildup, minor leaks, or drains that are rarely used and remain damp for long periods.
One of the most common mistakes is thinking that using insecticides is enough to eliminate the flies. However, simply killing adult flies does not resolve the root cause of the problem. If dirt continues to build up inside the pipe, the insects will reappear after a few days.
To identify their source, some experts recommend placing a small strip of clear adhesive tape over part of the drain overnight, leaving a gap for air circulation. When checked in the morning, the drain with the highest number of trapped insects is likely the main source of the infestation.
A thorough cleaning of the drain is usually the most effective solution. The first step is to remove the drain grate and clear away hair, soap residue, and visible dirt. Next, it is advisable to scrub the inside of the pipe with specialized flexible tools. This procedure helps remove the organic layer where the larvae develop.
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