glass back

I'm trying to attach a magnetic plate (for a vent mount) to the back of my honor 8, and this glass surface is like magic, nothing will stick to it! The double-sided tape that came with the plate held for about 5 seconds; hot-glue (my usual fool-proof solution) popped off instantly. Super-glue...

So I've had my Xperia Z for about 2 months now and it has endured water tests, and stress test (software wise). I'm completely satisfied with the results. However I was cleaning my phone with my microfiber cloth and noticed something odd when cleaning. As I look up at the top left of the device...