The Only replay I got was from PTC tech support:
There is no OOTB way to achieve your request. Deleting user workspaces
is a risky matter...
But you may try to use the attached utility (DeleteWorkspaces.jar).
Instructions for DeleteWorkspaces.jar:
Please use the attached utility (DeleteWorkspaces.jar) to delete these
workspaces:
1. Stop Windchill server
2. Extract the contents of the jar file DeleteWorkspaces.jar to:
$WT_HOME/codebase directory
3. Restart method server
4. Start Windchill Shell
5. From windchill shell execute command: windchill
com.ptc.cust.wsdelete.DeleteWorkspaces Administrator
6. Login as administrator user when asked for authentication
This utility will create a log file "DeleteWorkspaces.log". In steps 5,
you may change the user accordingly to the user's workspaces you want to
delete, i.e: Administrator, demo, user1 etc...
