Here's the apps that would help you on how to remove all tweets on twitter at one command.
Try TwitWipe apps. TwitWipe is a tool to wipe or delete all your tweets in one go. You may need to do this to start over, to clean it out before handing the account over to someone else, or maybe you've just realised how shitty your tweets are. And all this is free.
Think more times before you take away of your tweet in your account.
You can't get your tweets back. There's no undo button. I don't want to make TwitWipe back up tweets, because that sounds lame.
How To Use (TwitWipe) Application?
1. Visit TwitWipe Login page.
2. In the right there is an option to grant access to TwitWipe application. You need to grant TwitWipe access to your Twitter account.
4. It will now ask you to confirm your decision.There are two options “Yeah!” or “No!!” If you have decided to delete all tweets click on Yeah or if you don’t want to delete your tweets, you can click on No and go back always!
About signing in: TwitWipe uses oAuth, so you don’t need to give out your password for this to happen. Although it’s very unlikely that you’d have to worry about even if it did ask you for the password, because it is, you know, deleting all your tweets! What’s the worst that could happen?