We're into salt season up here in Vermont and I have a concern about washing the underside of my car. A long time ago someone posted about the possibility of pulling water into the manifold(?) on some of the Audi engines. Does anyone remember and could you advise me. It was about a year ago and I can't find it in the archives. TIA Berthann 1988 5000CSTQ, 136k and needs underside desalinated