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is screen protector in touch bar and screen of macbook pro bad?
MacBook Pro 13″, macOS 11.3
What would be the purpose of a screen protector on a non-touch screen?
I would not place anything between the keys and the display. I would not adhere anything to the screen.
Do not use palm rest or keycap covers on a Mac notebook with a Retina display - Apple Support
What I can say is that Screen protector is unnecessary.
About cleaning your Mac notebook's screen:
https://support.apple.com/guide/mac-help/clean-your-computer-screen-mchlp2657/mac
Screen protector
