If you've posted something that you'd rather take back, you can remove it easily. When you hover over your Tweet while viewing your home or profile page, you'll see a few options appear below the message.
Voila! Gone forever... almost. Deleted updates sometimes hang out in Twitter search. They will clear with time.
We do not provide a way to bulk-delete Tweets. If you're looking to get a "fresh start" on your Twitter account without losing your username, the best way to do this is to create a temporary account with a temporary username, and then switch the username between your current account and the temporary account. Please see our article on How to Change Your Username for more info.
Check out our Tweet & DM Troubleshooting section for solutions to commons problems.