Screen stains on macbook air m1

Howdy my macbook air m1 screen (which I have for a few weeks) starts to have some strange stains that I can not eliminate using a new microfilm cloth (I tried to moisten with a little water and then rinse). What's the matter? what is usually used for this purpose?

The screen in the peripheral areas is not as shiny as in the central part. I thought it was dust, a sign of fingers, etc. But passing the cloth remains the halo. Do you think a specific product is needed?

I also read other users issues about problems of screen breakages related to micro grains, is it possible? Do you use special protections between the keyboard and the screen? (or do you know if Apple recommends them?)