Like everything else "they" are gradually making keyboards so cheap and nasty that it won't be worth trying to keep them clean - just chuck 'em out when they get too grotty. I cut my typing teeth on WWII-designed teleprinters, hence I am a nine-fingered typist.
I just got a catalogue in which there's a keyboard you can roll up when not in use, just two or three plastic membranes with conductive print. Far cry from my oldest keyboard in which each key depressed a little magnet that in turn caused a reed-switch to close and send the character. Weighed a ton but a superb piece of engineering.
I bet in another ten years (or less) keyboards will be in computer museums along with DVD's and mobile-phone cameras. Voice control is still a long way from perfect but it'll come, of that I have no doubt (I wonder how you'd enter your passwords???).
GG
"The Gods made Heavy Metal"