Wash the Airstream using an automotive wash to remove any dirt or debris from the trailer. Rinse it off thoroughly and let it dry completely.
Tape off any areas of the Airstream that you aren't going to polish using masking tape. This includes the windows, any airbrushing and wooden components, such as wood frames around the windows or rear doors.
Apply light blue or medium grade cream metal polish to a small section on the front of the trailer using a sponge. You should start from the top of the trailer and work your way down.
Buff the area that you applied the metal polish to using an orbital sander with a buffing pad. While it is possible to do this by hand, your arms will get tired well before you finish the entire trailer.
Repeat steps two and three working around the entire trailer. Once you finish the front, including the tongue, move on to each side and then do the back.
Go over the entire trailer using a polishing pad on the orbital sander. This will make the brushed aluminum shine like brushed chrome.
Polish the top of the Airstream trailer, if desired. Do this in the same way you polished the rest of the trailer. You should cover your shoes with old, soft shirts if you step on the top of the Airstream. Make sure that you are very careful when climbing to polish the top.