First of all I must apologize for such a trivial question, however as the title says, how do you keep the keyboard clean? I'm not one to eat with dirty hands or even eat while I use the laptop, however after time there might bee some oil marks on the laptop. I realized this especially after I sold my old MacBook Pro a little while ago, and now after receiving the new one, I don't want it to reach the condition that one had gotten to. I do use a compressed air duster, I've always just used Isopropyl Alcohol wipes for the keyboard, is this something I should continue to use or does anyone here have a better suggestion? Thanks!