When you want to delete all macros from a workbook or document you can use the macro below. The procedure can be used in both Excel and Word without any editing. It also assumes that you in newer versions of Office has allowed code to access your VBProjects.

Sub RemoveAllMacros(objDocument As Object)
' deletes all VBProject components from objDocument
' removes the code from built-in components that can't be deleted
' use like this: RemoveAllMacros ActiveWorkbook ' in Excel
' or like this: RemoveAllMacros ActiveDocument ' in Word
' requires a reference to the 
' Microsoft Visual Basic for Applications Extensibility library
Dim i As Long, l As Long
    If objDocument Is Nothing Then Exit Sub
    i = 0
    On Error Resume Next
    i = objDocument.VBProject.VBComponents.Count
    On Error GoTo 0
    If i < 1 Then ' no VBComponents or protected VBProject
        MsgBox "The VBProject in " & objDocument.Name & _ 
            " is protected or has no components!", _
            vbInformation, "Remove All Macros"
        Exit Sub
    End If
    With objDocument.VBProject
        For i = .VBComponents.Count To 1 Step -1
            On Error Resume Next
            .VBComponents.Remove .VBComponents(i) 
            ' delete the component
            On Error GoTo 0
        Next i
    End With
    With objDocument.VBProject
        For i = .VBComponents.Count To 1 Step -1
            l = 1
            On Error Resume Next
            l = .VBComponents(i).CodeModule.CountOfLines
            .VBComponents(i).CodeModule.DeleteLines 1, l 
            ' clear lines
            On Error GoTo 0
        Next i
    End With
End Sub