The answer to 'how to clean sump pump' is to clean the sump pump regularly to ensure it is functioning properly. This involves unplugging the pump, removing debris and sediment from the sump pit, and inspecting the pump for any wear or damage. It's also important to check the float switch to make sure it is moving freely and the pump is activating as needed.
Cleaning the sump pump should be done every 6-12 months, or more frequently if the sump pit collects a lot of debris. If you notice any issues with the pump, such as it not turning on or making unusual noises, it's best to call a professional plumber to inspect and repair the system.