Keyboard behaves strangely - buttons act as if being held down
I knocked a bottle of water onto my lenovo laptop keyboard a while ago. I believe it was on at the time. The keyboard stopped working, so I now use a wireless keyboard. Generally, it's okay, but it keeps doing this strange thing where a key on the laptop keyboard will behave like it's being pressed constantly. This manifests itself in these ways:
Alt acts like it's being pressed very rapidly, displayed by the File bit at the top of the browser flashing blue.
B, space or 0 sometimes act like they're being held down. I noticed this when I was trying to enter a password.
Sometimes, it acts as if alt gr and arrow keys are being held down and the screen just rotates randomly.
I can fix all of these temporarily by running my hand back and forth across the keyboard like a mad pianist, but it's not an ideal solution and doesn't last very long.
I'm assuming that the laptop keyboard is impossible to mend, but I was wondering if there's a way for me to shut it off or tell the computer to ignore it.
Thanks very much in advance.