Open Safari
Click Safari in the menu bar
Select Settings
Click the Privacy tab
Click Manage Website Data
Click Remove All
Click Remove Now
Close the Settings window
To clear browsing history and cache together:
Click Safari in the menu bar
Select Clear History
Choose a time range
Click Clear History
To enable the Develop menu:
Open Safari
Click Safari in the menu bar
Select Settings
Click the Advanced tab
Turn on Show features for web developers
To clear cache only:
Click Develop in the menu bar
Select Empty Caches
Restart Safari