Deleting items in model space that aren't seen inside paper space - AcadPViewport

I have a difficult (at least for me) problem. I'm using VBA inside of
AutoCAD 2006. What I'm trying to accomplish is a sort of drawing
clean-up. All of the drawings my company creates need to go through
this clean-up process, so I've been asked to automate it.

The end result is that any items that aren't being used inside any of
the layouts should be deleted from model space.

Each drawing has at least one layout within paper space.

When I run the following code, the TypeName of the viewports are all
"IAcadPViewPort2" :
Dim objAcadObject As AcadObject
Dim strName As String

For Each objAcadObject In ThisDrawing.PaperSpace
strName = TypeName(objAcadObject)
Next

The solution as I see it (please tell me if you have any better ideas)
could be laid out in the following code/pseudo-code :
'Variables
Dim objAcadObject As AcadObject
Dim objLayout As AcadLayout

'Go to paperspace
ThisDrawing.ActiveSpace = acPaperSpace

'SELECT ALL items in one of the viewports.
'This is the same as selecting all items in model space
For Each objLayout In ThisDrawing.Layouts
For Each objAcadObject In objLayout.Block
If TypeName(objAcadObject) = "IAcadPViewport2" Then
'SELECT ALL
'Exit the loop since the selection is done
Exit For
End If
Next
Exit For
Next

'UNSELECT all visible items in each viewport inside paper space
For Each objLayout In ThisDrawing.Layouts
For Each objAcadObject In objLayout.Block
If TypeName(objAcadObject) = "IAcadPViewport2" Then
'UNSELECT all items visible in the viewport
'Same as holding down the shift key and using an X box
inside the viewport
'UNSELECT
'objAcadObject.Delete
End If
Next
Next

'Any items still selected are not being used inside paper space.
'Since they are not being used, they can be deleted, so delete
them!
'DELETE

The selection and delete processes are what I can't figure out. Any
help would be EXTREMELY helpful!!!!

Thanks in advance,
Brian W.

 

I'm sure I replied to this already - but I can't see my post.

I'd simply wblock the contents of the viewport to a new file - and
then insert the old view port into the new file and save that back
over the old file.