To clean a hydroponic system, you should first drain the nutrient solution and rinse out the reservoir and all other components of the system. You can use a mild cleaning solution, such as water and vinegar, or a specialized hydroponic cleaning solution, to help remove any buildup of mineral deposits or other contaminants. Be sure to rinse thoroughly with clean water after cleaning to remove any residue. You may also want to disinfect the system with a mild bleach solution or hydrogen peroxide to kill any bacteria or fungus. Make sure to rinse the system thoroughly with clean water after disinfecting. It’s also important to regularly maintain and clean your hydroponic system to ensure optimal growth and health of your plants.