Workflow to delete Folders

 Hi All,

I've successfully managed to create a workflow to delete files after a period of time. How ever the workflow doesn't remove the folder.

I have tried  the following in sharepoint designer under the delete item action

Delete Item in Rc Approval WF Doc Lib

Then added the following values

List: Rc Approval WF Doc Lib
Field: Rc Approval WF Doc Lib: Content Type
Value: Folder

But it doesn't work.

Any help would be much appreciated

Regards

Robert