InboxCleaner is a twitter app allows to clean direct messages of your twitter account easily. With InboxCleaner, you can delete all direct messages received, or filter direct messages sent by a specific user and remove them.
This app uses Oauth to access your account, so you don’t need to worry about giving your password. Sign into Twitter with username and password, then visit InboxCleaner page and click “Sign in with twitter”.
After you allowed this app to access to your Twitter account, this app shows direct messages in your inbox and options to “Delete all messages”, “Delete messages from user”.