Streaks left on Mac screen

Hello materlep,

Thanks for asking the Apple Support Communities for help with cleaning your Mac display.

This article talks about this: How to clean your Apple products - Apple Support

"To clean the screen on your MacBook, MacBook Pro, or MacBook Air, first shut down the computer and unplug the power adapter. Dampen a soft, lint-free cloth with water only, then use it to clean the computer's screen."

If after doing this you still have a problem, I recommend having the computer checked at an Apple Authorized Service Provider or Apple Store.

Please make a backup before taking the computer in to your appointment: Use Time Machine to back up or restore your Mac - Apple Support

Also, you will need to have your Apple ID and password handy when visiting a service provider. Check this help article under the bottom section titled "Get ready for service" for other items to ensure you are prepared: Mac Service and Repair - Apple Support

You can find a service provider using this link: Apple Find Locations

Thanks and have a wonderful day.