You could take the keys off on an individual basis but you've then got to get them back on again - if there's a spring that's gone flying across the room when the key has been removed or proving a bit tricky to reassemble afterwards.....:-)
Keep the tea and coffee away and, in the meantime, run a small child's paintbrush along the channels made by the keys and then in between individual keys. An air spray aerosol might get some of the muck out first.
You can clean the keyboard itself with a weak solution of household multipurpose cleaner (Mr Muscle Orange or similar) used on a cloth squeezed almost dry first. It also works well on system and monitor cases.