Thought I should point out that you won't need to "unplug the keyboard". That would only be a good plan on an external wired USB keyboard.
The MacBook should be powered Off.
Clean cloth, dampened with Isopropyl alcohol (not wet or dripping!) - Just damp enough to clean those keys.
Although alcohol would evaporate quickly enough that a few drips should not be a problem, I prefer to not make problems, if I don't have to. 😎