Попробуйте код ниже:

Option Explicit

Sub deleterow()

Dim i As Long, LastRow As Long

With Worksheets("New")
    LastRow = .Cells(.Rows.Count, "A").End(xlUp).Row

    For i = LastRow To 1 Step -1
        'If .Cells(i, 1).Interior.Color <> xlNone Then
        ' replace RGB(255, 255, 255) with the "white" color
        If .Cells(i, 1).Interior.Color <> RGB(255, 255, 255) Then
            .Rows(i).Delete
        End If
    Next i
End With

End Sub

Удалить строку без цвета

Версия для союза

Option Explicit

Sub DeleteNoColorRow()

    Const cSheet As Variant = "Sheet1"  ' Worksheet Name/Index
    Const cFirstR As Integer = 1        ' First Row
    Const cColumn As Variant = "A"      ' Column Letter/Number

    Dim rngU As Range     ' Union Range
    Dim lastRow As Long   ' Last Row
    Dim i As Long         ' Row Counter

    With ThisWorkbook.Worksheets(cSheet)
        lastRow = .Cells(.Rows.Count, cColumn).End(xlUp).Row
        For i = cFirstR To lastRow
            If .Cells(i, cColumn).Interior.ColorIndex <> xlNone Then
                If Not rngU Is Nothing Then
                    Set rngU = Union(rngU, .Cells(i, cColumn))
                  Else
                    Set rngU = .Cells(i, cColumn)
                End If
            End If
        Next
    End With

    If Not rngU Is Nothing Then
        rngU.EntireRow.Delete ' Hidden = True
        Set rngU = Nothing
    End If

End Sub