Excel 2003 w/VBA 6.3

Have a form with several textboxes in which a user will insert values.
The names of all the textboxes start with "txt", e.g. txtLotNum.
During the course of running the program I purposely "clear" (see below) the values from all textboxes. However, I would like to retain the value of one of the textboxes, so that when the user starts the program again after closing, that value already appears in the textbox on the form. Cuts down on data entry.

For Each Ctls In frmEasyLyteQC.Controls
        If Left(Ctls.Name, 3) = "txt" Then
            Ctls.Value = ""
        End If
Next Ctls