I've added a macro to the file and included a button on the Quick Access Toolbar to run that macro. The macro is below...
Code:
Sub ClearForm()
Dim aCC As ContentControl
For Each aCC In ActiveDocument.ContentControls
aCC.Range.Select
If aCC.Type <> wdContentControlDropdownList Then
aCC.Range.Text = ""
Else
aCC.Type = wdContentControlText
aCC.Range.Text = ""
aCC.Type = wdContentControlDropdownList
End If
Next aCC
End Sub