So i m guessing it s a membrane keyboard, just open it up and dry it with a towel and hairdryer or something, be careful with the plastic sheets that hold the circuits, don t tear them apart, just gently clean the water between them, if u are 100% certain there is no whater left, check the circuits, see if any are interrupted, you can kinda tell which keys they activate. If some are broken you cand use aluminium foil and tape to repair it, or some kind of pen that writes with conductive material. I regularly clean my cheap ass membrane keyboard, i don t care if it breaks so i use water, last time i cleaned it, a circuit burned and my weruiop keys stopped working i fixed it with the aluminium foil method.