This happens because new MacBooks are super thin. When you squeeze the laptop inside a tight sleeve, the screen gets pushed right against the keyboard. That leaves key-shaped marks of finger oil and dust on your screen.
How to clean your screen:
- Turn off your Mac and unplug it.
- Gently wipe the screen using a soft, slightly damp cloth (like a microfiber cloth for glasses).
- For greasy smudges, put a tiny bit of 70% rubbing alcohol on the cloth.
- Never spray liquid directly onto the screen, and avoid paper towels or window cleaners.
How to prevent it:
- Use a looser sleeve: Make sure your case isn't squeezing the laptop tight when zipped shut.
- Keep keys clean: Wipe your keyboard often so oils don't build up on the keys.
- Avoid keyboard covers: Do not use plastic keyboard covers, palm pads, or screen protectors. They make the gap too tight and can crack your screen when you close the lid.
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