The detergent breaks down the surface tension of the water. The flies cannot stay afloat and fall into the mixture.
Step 5
Place the container:
near the fruit basket;
next to the trash;
often near an open window;
or on a terrace with a lot of flies.
In the merits of better results
The trap works even better if:
replace the mixture every two to three days;
clean the container regularly;
Set up several traps in