You can delete your entire Amazing Marvin account anytime. This will wipe all your data from our databases. 

We can't do this for you for security reasons. 

In the main view, click the menu button at the bottom left and go to "Account".
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Select the "Trash & Delete" tab on the left side. After that, click the "Delete Account" button:
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It will then ask you to confirm the deletion:​

Enter your password, click "OK" and your Amazing Marvin account is gone.