On most recently made keyboards the switches themselves are "sort of" waterproofed, so you may be able to pop the keycaps off and do a reasonably good cleanup, but advice to just get a new board is probably the "sane" approach.

You might want to try the "Smithsonian method" by laying the keyboard on an anthill (choose small ants) and let the little buggers gnaw the sugar off. Smithsonian breeds special "carrion beetles" of several types for "delicate cleaning" jobs, but don't do mail order so far as I know.

John