How can I make the xmlserializer only serialize plain xml?

To put this all together – this works perfectly for me:

// To Clean XML
public string SerializeToString<T>(T value)
{
    var emptyNamespaces = new XmlSerializerNamespaces(new[] { XmlQualifiedName.Empty });
    var serializer = new XmlSerializer(value.GetType());
    var settings = new XmlWriterSettings();
    settings.Indent = true;
    settings.OmitXmlDeclaration = true;

    using (var stream = new StringWriter())
    using (var writer = XmlWriter.Create(stream, settings))
    {
        serializer.Serialize(writer, value, emptyNamespaces);
        return stream.ToString();
    }
}