It isn't horrible but I do notice sometimes there's a little grime/oils on the keys that kind bothers me. I can't really feel it, I can just see it when I am in a super bright environment. I don't really want to introduce moisture to clean the keys and they all obviously move so that makes it tough to wipe them down. What do you guys do to occasionally freshen up your MacBook? Also what about speaker grills? I can foresee things getting stuck in those tiny little holes, what would you do there?