Wooah!! Mate, that makes me feel dirty just looking at the picture! Surely you have to be trying to make a keyboard end up like that. Maybe he was attempting to get some DNA lodged with you. Can confirm after cleaning my deck this weekend following a spillage that isoprop leaves it nice and clean with no obvious ill effects. Rather pleased with the result. But thoroughly avoid this on anything you treasure - it took the actual colour off my penknife once.
Boak. Man that is disgusting. I add a soft brush to the hoover, and give it a going over when doing the housework.
Other than washing your hands a lot, there's not much you can do about it. Keycap material and design can play a part in this though. Smooth ABS caps being worse, and textured PBT caps being best. I just wash my hands a lot. I do tend to have very dry hands as well. My boards tend to never really need cleaning. I also use a dust cover over them when not in use, which helps with dust build up under the keys. I've also banned my cat from my desk Some people just have more oil on their skin though. If you are one of those types, then regular wipe down with a alcohol moistened lint free cloth after every session is what I would recommend.
