Open Finder
Click Go in the menu bar
Select Go to Folder
Type ~/Library/Caches and press Return
Open each folder inside Caches
Delete the files you want to remove
Empty the Trash
Open Safari
Click Safari in the menu bar
Select Settings
Go to the Privacy tab
Click Manage Website Data
Click Remove All
Confirm the action
Open Chrome
Click the three dots menu
Select Settings
Click Privacy and security
Click Clear browsing data
Choose Cached images and files
Click Clear data
Open Firefox
Click the menu button
Select Settings
Click Privacy & Security
Scroll to Cookies and Site Data
Click Clear Data
Select Cached Web Content
Click Clear
Restart your MacBook Air after clearing cache