I can definitely see what you're talking about. Did you use the rubbing alcohol immediately after removing the sticker? My first thought was that there was glue residue on your phone that collected dust/smudges/etc. I would think that it's not under your glass, but I could be wrong. Don't see how that could happen.
You might try this: dip one end of a cotton swab into cooking oil. Just get a very small amount on the end of the swab. Any type of vegetable cooking oil will do. Carefully smear a very thin layer of the cooking oil onto the area where the sticker was. Let it sit for at least an hour. Use another cotton swab to gently rub the area for a few seconds. Use soap and warm water on the area to remove the oil. It sounds crazy, but vegetable oil is really good at removing glue residue used to affix stickers. Before anybody goes off on me for suggesting using vegetable oil and warm soapy water to clean a phone, it's just a suggestion. I'm assuming the op would take extreme caution.
Thank you for the advice, I'll give it a try.
When I say it is "under the glass", it is because if I rub my finger over the spot, I still can see the darker spot through (beneath) the finger print/oil.
There is absolutely no glue residue on the screen. It is more like a discolorated mark. In fact, it is the same effect that you would get if you removed a sticker on a glass that you left there for years exposed to the sun
Nothing is perfect and I have to focus on other stuff
I am still in my return period but my phone is really performing well (no lag/stutter and I'm getting 264k-265k on Antutu). Not too warm at the idea of returning it. I'll probably put it in a Spigen case instead.
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