I got the following reply from Thao, the second option worked for me:
You can run the following VBA code to remove those unwanted controls.
Sub Test()
While ActiveSheet.Shapes.Count <> 0
ActiveSheet.Shapes(1).Delete
Wend
End Sub
Caution:
The code above will remove all shapes (form control, drawing shapes, textboxes, OLE, etc) from the sheet.
So make sure you have a backup copy of the workbook.
Caution:
If you only want to delete a specific object type (in this case, form controls), use the following code.
Sub Test()
start:
For x = 1 To ActiveSheet.Shapes.Count
If ActiveSheet.Shapes(x).Type = msoFormControl Then ‘<<<<<<< you can change msoFormControl to other type
ActiveSheet.Shapes(x).Delete
GoTo start
End If
Next
End Sub