Not much in there apart from a PCB, so if you're careful, it should be OK. But, if it hasn't shorted anywhere, it should dry out itself anyway - unless there's a lot of crystalized sugar in there!
Mine keeps getting full of things like biscuits crumbs (don't even ask!), and I just turn it upside down and give it a shake now and then!
Worst case scenario is a new keyboard, from about £6 or £9 upwards from Argos etc, or I have a spare one if you need it.