i have searched this forum and honestly don't know where else to ask this question. i've owned an ao521 10.1" netbook since november 2010 and have loved it from day one. unfortunately, some of the letters on the keyboard have attracted fingerprint residue. what would be the safest route to take to clean these buttons? i've heard that an all purpose cleaner could work but want to be cautious before doing anything. thanks in advance!