so the isopropyl alcohol always worked for me in the past when I had a 2013 MacBook Air, but after I upgraded to a 2019 Mac Pro it leaves horrible grease smears all over the display no matter the buffing with micro fiber towels. Maybe the screen changed? Just tried a damp paper towel with just a very small amount of dish soap, VERY SMALL! Used a circular cleaning motion and made sure to get the corners and edges. It looked like it didn’t work at first but a lite buff with a microfiber cloth and boom! Just like new! Hate watching a high def movie and all you see are those greasy portions in the darker scenes, plus try to take care of things that cost as much money as apple charges for their products! I still use the isopropyl alcohol for the rest of the computer. Don’t know if its just me but I multitask a lot and my keyboard gets gross! Hope this helps you
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=== Update (08/18/2021) ===
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and as I see now, there are may others that have tried this with success but their directions are far better than mine!
so the isopropyl alcohol always worked for me in the past when I had a 2013 MacBook Air, but after I upgraded to a 2019 Mac Pro it leaves horrible grease smears all over the display no matter the buffing with micro fiber towels. Maybe the screen changed? Just tried a damp paper towel with just a very small amount of dish soap, VERY SMALL! Used a circular cleaning motion and made sure to get the corners and edges. It looked like it didn’t work at first but a lite buff with a microfiber cloth and boom! Just like new! Hate watching a high def movie and all you see are those greasy portions in the darker scenes, plus try to take care of things that cost as much money as apple charges for their products! I still use the isopropyl alcohol for the rest of the computer. Don’t know if its just me but I multitask a lot and my keyboard gets gross! Hope this helps you