I don't know about milk in a laptop(it will sour)but, we spilled red wine on a closed laptop and it ran into it from the logo on the top. (Packard Bell) Of course the warranty was long gone. The shop want too much money just to look at it, so...we were ready to throw it away. Once we were sure that it was dry we tried it. It made a horrible whistle when we turned it on. We kept it on in an area of the house that was cool, and protected in case of a fire. However, after a few weeks the laptop started working again. This was more than four years ago and the lap top is still working.