That's very useful stuff to know. In that case what would you suggest would be the ideal cleaning regime for Airstream vans, incl materials etc.
Not a expert but my guess is that the whole of the Airstream will have a clear coat similar to a painted vehicle so will need polishing and protecting in a similar way.
Just found this info on the type Aluminium used in the past, clear coats and why some of the older Airstreams you see at shows have an incredible mirror finish.