An additional Skype directory needs cleaning...

Forums: 

This folder: %AppData%\Microsoft\Skype for Desktop\CS_skylib

Contains all of the .conf files that are created when you log in to Skype.
If you have user accounts you'd rather not be found, the folder needs to be wiped.

BleachBit version: 
4.2.0
Your operating system: 
Windows 10