Revoke application-specific passwords
If you lose a phone or stop using an application that was authorized with an application-specific password, we recommend revoking its application-specific password so no one can access your Google Account from that device:
- Visit the Authorizing applications & sites page under your Google Account settings and sign in with your username and password if prompted.
- Look for the “Application-specific passwords” section.
- You can see a list of the applications that you’ve generated application-specific passwords for. To revoke a password, click Remove next to the phone that you no longer want to be authorized to access your account.
Once revoked, that application-specific password can't be used to access your Google Account. If you want to start using an application or device again, you'll need to generate a new application-specific password.