Power off the Mac or disconnect external power
Unplug all cables connected to the Mac
Use a dry, soft, lint-free cloth (microfiber preferred)
Wipe the screen gently in one direction, then switch direction if needed
If needed, lightly dampen the cloth with water only (do not spray liquid directly on the screen)
For stubborn smudges, use a small amount of isopropyl alcohol on the cloth (water-based cleaner if recommended by the display manufacturer)
Wipe gently until clean, using a fresh section of the cloth as it gets dirty
Dry the screen with a clean, dry microfiber cloth after damp cleaning
Clean the bezel and ports with a dry microfiber cloth
Use compressed air only for dust in vents/crevices (hold the can upright)
Avoid these materials: paper towels, tissues, rough cloths, abrasive cleaners
Avoid spraying any cleaner directly onto the display
Avoid getting moisture into openings (ports, speakers, camera area)
Avoid these chemicals: bleach, ammonia, hydrogen peroxide, window/glass cleaners, aerosol sprays
Let the screen fully dry before powering on or closing the lid