- Create a new
Standard
User (name it ex.Blah
), - Log in as this user and setup account as you want it to be for Guest,
- Log out,
- Log in as any administrator (for
root
skipsudo
), - Execute those commands:
sudo rm -rf /Users/Blah/Library/Caches/*
sudo rm -rf /Users/Blah/Library/Keychains/login.keychain
sudo rm -rf /Users/Blah/Library/Preferences/SDMHelpData