The owners of the parrots should try to change the water and food dishes every day. This helps make sure that the food and water stay fresh and don't get spoiled by mold or bacteria. But it's important to remember that different things can change how often you need to clean your parrot's dishes. For instance, if your parrot eats or drinks in a messy way, you may need to clean and change the dishes more often during the day. In addition to cleaning your parrot's dishes every day, it's also a good idea to sanitize them every so often to stop harmful bacteria from growing. You can do this by washing the dishes in hot, soapy water and giving them a good rinse.