Then select Overview in the side panel and click Sign Out.Choose iCloud in the side panel and Turn off Find My Mac.Choose Apple menu > System Preferences, then click Apple ID.When prompted, enter your Apple ID and password. Open iTunes. From the menu bar at the top of your computer screen or at the top of the iTunes window, choose Account > Authorizations > Deauthorize This Computer.
If your computer has not been updated to Catalina, you will need to deauthorize your computer from the iTunes app. Resetting a Mac to factory settings deletes all the data stored on that device, you can make a backup of the data using Time Machine software Apple provides - Here's how to back up using Time Machine. You should back up your computer, disable some features and services, and then go on booting to Recovery Mode and using Disk Utility to erase (format) a hard disk and reinstalling macOS. Do not use aerosol sprays, solvents, or abrasives that might damage the finish.Things you can do before you erase a Macbookīefore you erase your Mac, make sure your Mac is currently connected to the internet and plug in the power adapter, so there's no danger of running out of battery power. Do not spray liquid directly on the computer. Then use a damp, soft, lint-free cloth to clean the computer’s exterior. When cleaning the outside of your MacBook, MacBook Pro, or MacBook Air, first shut down your computer and unplug the power adapter. Do not spray cleaners directly onto the item.Don’t get moisture into any openings, and don't use aerosol sprays, solvents, or abrasives.Disconnect any external devices and other cabling from the product.Disconnect your Apple product from any external power sources.Abrasive cloths, towels, paper towels, and similar items may cause damage to the item. Here are some tips that apply to all products Product may have specific cleaning requirements, which may vary by the The materials used to make Apple products vary in some cases each I think I would follow this advice from Apple: How to clean Apple products
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