Application DLTTR removes ALL available tweets but Twitter has some limits and the count can be also not zero. Check the FAQ in the application.

★ World best tweet deleter
★ Can delete the latest tweets by an hour day week month year or all of them once
★ Can help you if you wrote anything you regret about and seconds matter or drunk tweets you cannot remember at all
★ Specially designed interface with a magic big red button
★ Start deleting your tweets today
★ Think about your info future
★ They are watching you

Warning: App deletes ALL AVAILABLE TWEETS check out FAQ and please don't rate app one star for this restriction.