Once in a while I have to clean my keyboard, as it gets really sticky even if I'm very cautious. ;-)
The last time I cleaned was quite a while ago (I reckon about 1 and a half years), so I did dismantle it completly—it was necessary! All the outer parts went into the dishwasher: the keys in the basket for the cutlery, the top cover on the top pullout. The bottom cover was pretty clean (after pouring out all the dust), so it was treated by hand.
And now it's shining again. For it's almost ten years (the testing date inside was of April 1995 ;-) it's in a pretty good shape.
But it would really be interesting to have a good keyboard which is completely sealed, maybe even to the extend that you can put it into the dishwasher altogether…
