Cleaned is a Tatango term that means a phone number on your list has been automatically unsubscribed, as we've determined that future messages to that specific subscriber will not be received.
The reasons why a number gets Cleaned varies greatly, but a few examples would be that the subscriber's wireless carrier turned their service off, the subscriber placed a black on short code messaging, etc.
How Cleaning Works
When a message is sent to a phone number, Tatango receives a response from the phone's wireless carrier, telling us if the message was received or not by the phone. If your message wasn't received, Tatango will designate that message as a Bounced message. If the bounce is a "hard" bounce, Tatango will immediately and automatically unsubscribe the phone number from your list.