Did you know that your keyboard may contain more germs than a toilet seat?
All key boards become dirty after use, even if you don't regularly eat or drink near them.
You can use compressed air to blow out debris that gets trapped between keys. Isopropyl alcohol on a Q-tip will do a pretty good job of cleaning lotion or grease off, and will dry fast. Keep an old make-up brush on hand for a quick brush out of dirt and hair. Slide a couple of post-it notes underneath with sticky side up to catch the crumbs.
Starting out with clean hands will also help!