Mysterious mark on laptop screen

rahul_c

Journeyman
I've a Dell Vostro 1510 which has a matte screen. I have used collin to clean the screen ever since I have bought it, that will be around 3 yrs and never faced any issues. But now there is a spot on the screen which is not going away. I have attached a pic, please help me out guys. IMG104.jpg
 
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