Excel: how do I remove all carriage returns from a cell?

Sub RemoveLineBreaks()
    Application.ScreenUpdating = False
    Dim rngCel As Range
    Dim strOldVal As String
    Dim strNewVal As String

    For Each rngCel In Selection
        If rngCel.HasFormula = False Then
            strOldVal = rngCel.Value
            strNewVal = strOldVal
            Debug.Print rngCel.Address

            Do

            strNewVal = Replace(strNewVal, vbLf, " ")

            If strNewVal = strOldVal Then Exit Do
                strOldVal = strNewVal
            Loop

            If rngCel.Value <> strNewVal Then
                rngCel = strNewVal
            End If
        End If
        rngCel.Value = Application.Trim(rngCel.Value)
    Next rngCel
    Application.ScreenUpdating = True
End Sub