Your computer monitor need regular cleaning to perform well and last longer. Here's the safe way to do it without damaging sensitive components.
Power off the monitor and unplug it. A dark screen makes dust and smudges visible.
Wipe the screen gently with a dry microfiber cloth to remove dust particles.
Dampen a clean microfiber cloth with distilled water. Wring until barely damp. Wipe in gentle horizontal strokes.
Use a slightly damper cloth on the plastic bezel and stand, which can handle more moisture than the screen.