Unfortunately you may have fried a component. Wiping the milk off only helped clean the surface liquid. There was likely still liquid that sunk beneath the keyboard down to the logic board. By continuing to operate with liquid on the logic board and other components you probably shorted some components.
My suggestion would be to use [guide|1363|this guide] to get to your logic board to do a visual inspection. See if you can find any burnt looking components. Be sure to look at any peripheral electronics too to see if those have suffered damage. Let us know what you find, hopefully it isn't too severe!