I have an Otterbox Defender for my iPhone six because I like some extra protection for weightlifting and golf. I take the case off after each of the activities. When I took it off after golf, I noticed a residue near the touchID ring. It lines up exactly with the thin plastic inside the otterbox that covers the touchID/home button when the case is in use. I wiped it away, but every time I use the phone the oil from my fingerprints collects in the same spots where I first saw the residue. I haven't had a chance to use an alcohol swab to clean it, but it's concerning that wetting it did not help rid me of the issue. I really hope they aren't microscratches (though they don't appear to be). Has anyone else noticed this issue?