I recently bought an iPhone 7 (jet black) and put it in a Power Support case called the Air Jacket Clear. However, some patterns are appearingl between the iPhone and the case. See the photo. I'm guessing the pattern is due to skin oil. My previous Power Support cases (on iPhone 3g and 5) did not have this problem. Has anyone else had the same pattern with their clear case? How do I remove the patterns on the back? Is it simply a matter of drying out skin oil before putting the phone into the case?