The answer to 'how to maintain garbage disposal' is to regularly clean and maintain your garbage disposal to keep it running smoothly. This includes running it with cold water, grinding ice cubes, and using a disposal cleaner or baking soda and vinegar to remove built-up food and odors. You should also avoid putting certain items down the disposal, like grease, fibrous foods, and hard items that could damage the blades.
Regular maintenance can extend the life of your garbage disposal and prevent clogs and other issues. It's also important to be cautious when working with the disposal, as the blades can be sharp. If you encounter any major problems or the disposal stops working, it's best to call a professional plumber for assistance.