The answer to 'how to clean humidifier' is to clean your humidifier regularly, typically every 1-2 weeks, to prevent the buildup of mineral deposits, bacteria, and mold. Start by unplugging the humidifier and disassembling it according to the manufacturer's instructions. Soak the removable parts in a solution of white vinegar and water to dissolve any mineral buildup. Use a soft-bristled brush to gently scrub the interior of the humidifier tank and other components. Rinse all parts thoroughly with clean water and let them air dry completely before reassembling the humidifier.
It's also important to change the water in the humidifier daily and clean the filter as recommended by the manufacturer. If you notice any significant mold or mineral buildup that is difficult to remove, it's best to call a professional HVAC technician for a more thorough cleaning and maintenance of your humidifier.