Most of us never consider cleaning the glass from the inside of our monitor like we do for an aquarium. It's essential, especially if your eyesight is failing. This advice is equally valid for portables where the plastic film quickly clogs up with micro-dust. It takes 2 seconds to start the utility below. Once started, with your mouse stroke the window repeatedly from left to right, then top to bottom. We clean for the fishes yet we tolerate grayed out screens for our own usage.
It works instantly, with no download time