The same happened to me too. When I cleaned the screen with an alcohol-based wet tissue...
It does get worse on the edges as when wiping it the liquid tends to get on the edges so it affects that part more.
The screen is coated with a fine (a few microns) layer.
If you care so much about your Mac to read the actual care guide, you can see it clearly says not to use anything else but a cloth with water.
The same happened to me too. When I cleaned the screen with an alcohol-based wet tissue...
It does get worse on the edges as when wiping it the liquid tends to get on the edges so it affects that part more.
The screen is coated with a fine (a few microns) layer.
If you care so much about your Mac to read the actual care guide, you can see it clearly says not to use anything else but a cloth with water.