Bat flies can be a nuisance around outdoor trash cans, but there are several effective methods to keep them away. First, ensure your trash cans have tight-fitting lids to prevent flies from accessing the waste. Regularly clean the bins with a mixture of water and vinegar or a mild disinfectant to eliminate odors that attract pests. Using natural repellents like essential oils (e.g., eucalyptus or peppermint) around the trash area can also deter bat flies. Additionally, avoid overfilling the bins and dispose of garbage frequently to reduce the chances of infestation. For long-term prevention, consider placing trash cans in shaded areas, as bat flies are less active in cooler spots. By following these steps, you can maintain a cleaner and pest-free outdoor space.