Now, using a SOFT cloth (NOT Tissues) start gently rubbing away at the affected areas, you'll hopefully notice that the smears are starting to disappear, and the screen is going back to normal.

Take EXTRA CARE NOT TO RUB AT THE EDGES WHERE THE RUBBER GASKET IS. We will come to that later.

You may have to repeat these steps a few times to achieve maximum results, but once satisfied with the vast majority of the screen being cleaned up and is looking nice and clear we can move onto the edges.