Cheese flies, also known as vinegar flies or fruit flies, are a common nuisance around outdoor trash cans, especially when food waste is present. Preventing these pests requires a combination of proper trash management and maintenance. Here are the most effective methods:

1. Seal Trash Bags Tightly: Ensure all food waste is securely wrapped in sealed bags before disposal to minimize odors that attract flies.

2. Use Lids and Liners: Invest in trash cans with tight-fitting lids and durable liners to block access for flies.

3. Clean Bins Regularly: Wash trash cans with soapy water or a vinegar solution weekly to remove residues that attract pests.

4. Avoid Overfilling: Keep trash levels manageable to prevent spills and easy access for flies.

5. Natural Repellents: Sprinkle baking soda or place citrus peels inside bins to deter flies naturally.

By following these steps, you can significantly reduce the likelihood of cheese flies swarming your outdoor trash cans. Consistency is key—regular maintenance ensures long-term prevention.