diff --git a/CleanDefinedNames.bas b/CleanDefinedNames.bas
new file mode 100644
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--- /dev/null
+++ b/CleanDefinedNames.bas
@@ -0,0 +1,96 @@
+Attribute VB_Name = "CleanDefinedNames"
+Option Explicit
+
+' ============================================================
+'  CleanDefinedNames  -  removes legacy/junk defined names
+'  Keeps a whitelist of real names; skips _xlnm built-ins.
+'  Excel Tables are not in the Names collection, so they are
+'  never touched. RUN ON A COPY FIRST.
+' ============================================================
+Sub CleanDefinedNames()
+    Dim nm As Name
+    Dim keep As Object
+    Dim deleted As Long, kept As Long, skipped As Long, failed As Long
+    Dim report As String, failedList As String, nmName As String
+    Dim i As Long
+
+    Set keep = CreateObject("Scripting.Dictionary")
+    keep.CompareMode = vbTextCompare      ' case-insensitive
+
+    ' ---- defined names to KEEP (point to Cover cells) ----
+    keep.Add "Report_Date", 1
+    keep.Add "Value_Base", 1
+    keep.Add "FSPR_Date", 1
+
+    ' ---- Excel Tables: not in Names collection, listed for safety ----
+    keep.Add "Addbacks.key", 1
+    keep.Add "Company.Codes", 1
+    keep.Add "DC.Code", 1
+    keep.Add "Dept", 1
+    keep.Add "Entity", 1
+    keep.Add "Forecasting.Periods", 1
+    keep.Add "Levels", 1
+    keep.Add "Months", 1
+    keep.Add "Period", 1
+    keep.Add "Period_end", 1
+    keep.Add "Plant.Codes", 1
+    keep.Add "SalesData", 1
+    keep.Add "Segm", 1
+    keep.Add "Statement", 1
+    keep.Add "TB", 1
+    keep.Add "TB.EBITDA2", 1
+    keep.Add "Table4", 1
+
+    Application.ScreenUpdating = False
+    Application.Calculation = xlCalculationManual
+
+    ' Iterate backwards (deleting while looping)
+    For i = ThisWorkbook.Names.Count To 1 Step -1
+        Set nm = ThisWorkbook.Names(i)
+
+        ' Reading .Name can itself raise on corrupt entries
+        nmName = vbNullString
+        On Error Resume Next
+        nmName = nm.Name
+        On Error GoTo 0
+
+        If Len(nmName) > 0 And keep.Exists(nmName) Then
+            kept = kept + 1
+        ElseIf InStr(1, nmName, "_xlnm.", vbTextCompare) > 0 Then
+            ' Built-in print areas / titles - leave alone
+            skipped = skipped + 1
+        Else
+            ' Corrupt names (=#NAME?, illegal chars) make Excel re-validate
+            ' and throw 1004 on .Delete. Swallow, try a fallback, and keep going.
+            On Error Resume Next
+            Err.Clear
+            nm.Delete
+            If Err.Number <> 0 Then
+                Err.Clear
+                nm.Visible = True       ' un-hide, sometimes lets it delete
+                nm.Delete
+            End If
+            If Err.Number <> 0 Then
+                failed = failed + 1
+                If Len(failedList) < 1500 Then _
+                    failedList = failedList & nmName & vbCrLf
+            Else
+                deleted = deleted + 1
+            End If
+            On Error GoTo 0
+        End If
+    Next i
+
+    Application.Calculation = xlCalculationAutomatic
+    Application.ScreenUpdating = True
+
+    report = "Done." & vbCrLf & _
+             "Deleted: " & deleted & vbCrLf & _
+             "Kept (whitelist): " & kept & vbCrLf & _
+             "Skipped (_xlnm built-ins): " & skipped & vbCrLf & _
+             "Failed (corrupt - need XML fix): " & failed & vbCrLf & _
+             "Remaining names: " & ThisWorkbook.Names.Count
+    If failed > 0 Then report = report & vbCrLf & vbCrLf & _
+             "First few that failed:" & vbCrLf & failedList
+    MsgBox report, vbInformation, "CleanDefinedNames"
+End Sub