Twitter is not having an option to delete mass direct messages from Twitter Account.Recently i came across a third party web tool DMCleaner which has an option to delete mass direct messages.
To use DMCleaner you need to grant permissions to the application.After authentication it will load all your direct messages and you will get a list as links:
Delete all DM’s
Delete all sent DM’s
Delete all received DM’s
Delete only DM’s with blocked users
Delete only DM’s with specific users
Delete only DM’s based on a specific date
Delete only DM’s containing specific words
You can choose to delete the direct messages as per your requirement.
DMCleaner is quick tool as it deletes Twitter direct messages in one click.
Tip: 3 Ways to Become Advanced Twitter User
Before deleting the messages you can also back up them.
Have you tried DMCleaner? Do share your views!