gibbous wrote...
Flip out the keys, wash them in a bucket with some dish-washing detergent, rinse them off, slap some ball-bearing grease on them, pop them back in, et voilà .
Takes five minutes, costs about a dollar for the ball bearing grease (if you don't have dish-washing detergent in your household, you have bigger problems than just a noisy keyboard).
You can use a small screwdriver or some thin device you can use as a lever to help prop the keys out.
But be careful, I had a friend who tried to do this (with the exact 1st gen G15), and although he seemingly pulled the keys out right and put them in after letting them dry, something went horribly wrong and the keyboard became completely useless (I saw the result, even pulled the entire keyboard apart and could not fix the problem). I think it may have been that a tiny bit of water, even after drying, might have slipped in and caused a short within the board. Of course he didn't leave the keys out to dry overnight, he just dried them with a paper towel.
If you love your keyboard so much (I assume you do, the G15 is a wonderful keyboard, I am a proud owner of a 2nd gen), you might consider doing this very carefully.
(to gibbous) Is standard ball bearing grease conductive? I assume you have done this yourself so it should be safe, right?