Strange "spot" on the background right in the middle of my display
During the last cleaning procedure of my laptop I have found strange spot in the middle of the display. Which is approximately 1x3mm in size. Invisible on black, but is perfectly visible on the light backgrounds. Looks like it is some kind of dirt or glue behind the display screen. When you change an angle of the display, then spot inverses it’s color.
What can it be? Is it covered by the warranty? Any advice is much appreciated. Thanks!