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Hang plastic water bags
A fly's eyes can detect minute changes in light patterns. Using this against them can be an effective fly repellent. Take a plastic bag, fill it 2/3 full of water, and securely tie the top with a string. Hang the bag outside your open windows and doors. As the sun hits the bag, light is reflected in all directions, confusing and disorienting flies, causing them to buzz off.
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