Open Safari
Click Safari in the menu bar
Select Settings
Go to the Privacy tab
Click Manage Website Data
Click Remove All
Confirm by clicking Remove Now
Open Finder
Click Go in the menu bar
Select Go to Folder
Type `~/Library/Caches`
Press Return
Delete the contents of cache folders you want to clear
Empty the Trash
Open Finder
Click Go in the menu bar
Select Go to Folder
Type `/Library/Caches`
Press Return
Delete the contents of cache folders you want to clear
Empty the Trash
Restart your MacBook Air
Open System Settings
Click General
Click Storage
Review large files and apps
Delete unneeded items
Clear app-specific caches from each app’s settings if available