What is the model of your PC?
You could possibly need a new face cover and motherboard. The water could have seeped through the keys onto the board damaging both. I suggest replacing both. Then your PC shall be sound. But without any more knowledge than that, that's what I can round up for ya!
Hello there! I have had an ACER for about 4 years now. Last week I spilled a bit of liquid on the keyboard. Shortly after that it was working in a chaotic way, same with the touchpad and there was this 40 sec beeping noise when I restarted the laptop. I went to buy usb mouse and keyboard and everything was working fine for a week and now again I have the same problem with the new ones. Also the beeping sound on start up is back again?