Mark keeps appearing on iPhone 6 Plus screen
Hi. i pre-ordered and recieve an iPhone 6 Plus today. i noticed after a couple hours that it had a "C" shape mark in the middle of the screen, whereby i cleaned the screen. After an hour or so later i noticed it had reappeared. And no matter how many times i clean the phone the mark keeps returning (if it disspears at all in the first place). Greasing the phone (with my own fingers) does seem to make the mark show up more.
it doesn't look like a scratch, it looks more like a grease mark, but nothing cleans that mark away. it looks like the mark could be under the screen maybe, but i shouldn't have a problem like this from a premium product with a premium price like this. is there something i can do to fix this problem myself or would i need to take it to an Apple store to either have the phone replaced or have the screen replaced? The only problem is that i was lucky to recieve the iPhone 6 Plus on release date, and i am worried if isend it back to an Apple store i will have to wait for 3 or 4 weeks for a replacement or repair, which is something i don't want to go through at all.
Has anyone else had this problem before, even on other phone makers (samsung, HTC, etc etc)?
Any help would be most grateful
Thanks
iPhone 6 Plus, iOS 8, 128GB