We've all posted tweets that we may regret but now you can easily go back and delete those tweets all the way back to when Twitter was launched. Just follow these steps below to delete your tweet.
1. Go to search.Twitter.com
2. Click on Advanced Search
3. Search for your user name Under People->From these accounts
4. Find the tweet you want to delete
5. Click on 3 little dots (...)
6. Select 'Delete Tweet'
Remember that this doesn't scrub your tweet from the rest of the internet but it at least gets it off your profile.