It may seem like a lot of work to get rid of flies using non-toxic method but it's better this way if possible.
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If you have enough patience, some simple home remedies can help in getting rid of flies naturally. Place a small bowl filled with apple cider vinegar near the sink or other places where the insects tend to gather. You'll be surprised at how quickly this natural fly killer eliminates pests from your kitchen.
Apple cider vinegar contains acetic acid which has been proven effective in killing house flies and fruit flies.