On the 13 inch macbook - can you pop off the keys individually and put them back on? Similar to say how you would on a standard keyboard? I wanted to know if anyone has done this? I thought I read in another post that you couldn't do this on the Macbook without removing the entire case? One of my kids spilled some soda on my keyboard and it is sticky. I wanted to know if I could just pop them off and clean it or if they don't just pop off. Has anyone done this? Thanks!