So flies do not fly into the house

Anyone who has ever been to the Algarve, in southern Portugal, may have wondered about this:

If windows or doors are open, especially in typical farmhouses, you can see plastic bags filled with water hanging from the upper beam and dangling in the sunlight.

When the sun's rays break and reflect in the water, the flies may be afraid of flying into the room underneath.

Every Portuguese in the Algarve knows this fly protection.

Even my German friends at home swear that it works ... but you need direct sunlight.

How to Get Rid of House Flies (4 Simple Steps) | March 2024