Yes, you should clean your humidifier every 30 days. Pay particular attention to the Atomizing Screen, Fan Blade, Pump Cone, Spinning Discs (Both of them) and the Reservoir Pan. Clean these gently to avoid damaging the parts.
Our BioCubes were especially developed for our foggers and they can help keep the fogger clean clean and make the job of cleaning easier. Also check for calcium buildup and use a calcium dissolving agent to remove any scale. Finally, if the unit is not going to be used for a few days or longer, drain the water out of the unit.