Although my trailer is a Boler
I have done exactly what you are asking, removed the windows
, polished all the aluminym and reinstalled.
I have created 2 videos which may help you, one is on dissassembly of the window. The second video is how I polished the door hinges. The same polishing process applies to the windows
EXCEPT the mill and extruded aluminum used on the windows
does NOT neeed grinding or sanding, you can go directly to the polishing wheel.