After washing our travel trailer we use Mequiars #49 as required to remove any heavy oyxidation or Meguiars # 50 with a light de- oxydizer and polish, one step(blue containers). These are both marine products and we buy them by the gallon. We just did the trailer today. We have tried other mequiars products as well as other brands and this is what my wife has cone back to.
http://www.autopia-carcare.com/megui...emover-49.html
http://www.autopia-carcare.com/megui...eaner-wax.html