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Once you clear credentials from the current instance, the ServiceNow Extensions for Visual Studio Code extension prompts some extensions may prompt for authentication the next time you open VS Code. You can continue working in the current session.

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• Navigate to View > Command Palette.
  You can also use a keyboard shortcut, Control+Shift+P on Windows or Command+Shift+P on MacOS to open the command palette.
• Choose Now: Clear Credentials from the command palette.
  Now: Clear credentials command
  The credentials of the current project are cleared.
• (Optional) Navigate to Code > Preferences > Settings > Workspace > Extensions > ServiceNow  to check whether the credentials and the instance URL have been deleted .for all extensions
  
• to clear ssh keys, also known as ssh targets, you can remove it on the SSH config file ~/.ssh/config where ~ is your home directory and exact path will vary person to person.
• It is also a good idea to clear the ssh host key/target off ~/.ssh/known_hosts which is the file used by almost every other ssh program.
  

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