Maggot infestations in outdoor trash cans can be prevented by implementing proper trash management practices. Regularly cleaning and sealing trash cans, using liners, and ensuring adequate airflow with screens or lids are crucial. Applying natural repellents like essential oils, lemongrass, and bay leaves can deter maggots. Advanced measures include using maggot traps and chemical treatments for severe infestations. Maintaining a clean and well-managed trash can area is essential for preventing maggot problems and ensuring a hygienic outdoor environment.