Most of the Skype users don’t know how to remove Skype chat history. But it is too simple.
You can delete your
* Instant messages
* Sent and received files.
* SMS messages
Please be aware before doing this. You will not be able to restore or recover this deleted information later.
1. Sign in to your Skype account.
2. In the menu bar, select the Privacy panel from Skype > Preferences.
3. Click Delete history. This may take few minutes to complete.