Website Data comprises of Caches, Cookies, Local Storage and Databases.
How to remove website data?
1. Empty Caches
Safari > Preference > Advanced
Checkmark the box beside "Show Develop menu in menu bar".
Develop menu will appear in the Safari menu bar.
Click Develop and select "Empty Caches" from the dropdown.
2. Delete Cookies
Safari > Preferences > Privacy > Cookies and Website Data...:
Click the “Manage Website Data” button.
Remove all cookies except ones from Apple, your internet service provider and banks.
3. Delete Databases and Local Storage items
Backup your Mac.
Quit Safari.
Hold the Option key on the keyboard down and click the “Go”menu in the Finder menu bar.
Choose “Library” from the dropdown.
Scroll down the list.
Click open the Safari folder.
Scroll down the list and click open the “Databases” folder.
Click open the “IndexedDB folder”.
If you find the items there, right click and choose “Move to Trash”.
Scroll down the list and click open the “Local Storage” folder
Right click the items you want to remove and choose “Move to Trash”.
Restart, launch Safari and test.
