I had discovered that little black rings had been forming around my iskin keyboard protector. Not sure if it's soot buildup from all the candles I had been building or just getting dirty over time. But after spending 10 minutes with some comet bathroom cleaner I have managed to remove most of it. Yikes, that was gross. Would have upset me terribly if the damage had been permanent. Now my keyboard protector is out off waiting to be washed. It's weird, feels very differently to be typing without it (and very loud too). :)