Here is a a general guide on how to remove saved Gmail accounts from your iPhone:
1. Removing Saved Accounts from Safari: If you’re using Safari to sign in and your accounts are saved there, you need to clear your browsing history and cookies. You can do this by going to Settings > Safari > Clear History and Website Data.
2. Removing Saved Accounts from Google or Gmail App: If you’re using the Google app or Gmail app, you can remove accounts by opening the app, tapping on your profile picture in the top right, and then tapping on “Manage accounts on this device”. From there, you can remove the accounts you no longer want to be listed.
3. Remove Google Account Data from iPhone: If you want to remove Google account information completely from your device, go to Settings > Mail > Accounts, select the Google account you want to delete, then tap “Delete Account” at the bottom.
Remember, these steps can erase some saved data, so ensure you have a backup of anything important.