How to solve the phenomenon that the keys of the upright digital piano cannot get up

First, the piano keys enter the water:
When a child is learning the piano, he accidentally knocks over the cup or mineral water bottle placed next to him, and the water or drink flows into the keyboard, and the wooden keys swell with moisture, resulting in inflexible movement and unable to stand up after playing. When encountering such a thing, immediately wipe off the water on the keys with a dry towel, and open the lid for natural ventilation. At the same time, a technical piano tuning lawyer is asked to remove the keys, wipe the water on each piano key clean and dry, especially viscous drinks, and dispose of them properly. Therefore, when learning the piano, you need to pay attention to the need not to put water or drinks next to the piano.
Second, the debris is stuck:
Some children play the piano while eating, and food scraps fall into the gap between the keys and jam the piano keys. When encountering such a thing, you can shake the piano keys back and forth left and right, shake the dirt down, and there is no problem with the piano keys. If it's not good, you can only ask a lawyer to help.
Third, the environment is wet and cold:
The reason why the piano keys cannot stand up and teach is that the piano keys return to moisture and swelling, resulting in inflexibility. We pay more attention to the maintenance of upright digital pianos to prevent this problem. Hang a humidity measuring instrument in the room where the piano is placed, and if you find that the ambient humidity exceeds 60%, you can hang a few packs of moisture-proof agent (silicone material) in the piano, or put some quicklime powder under the piano. If the relative humidity of the air is particularly large, it is necessary to turn on the air conditioning mode, or install a water-resistant pipe in the piano, and use the heating pipe to heat and drive away moisture. You can also buy a household to reduce the ambient humidity in the room.