by 48Rob » Tue Jun 12, 2012 6:49 am
JB,
You can use mineral spirits, or a diluted vinegar/water solution to clean the black off the aluminum.
Painting it is the easiest way to maintain it...
On a couple trailers that were just mill finish aluminum, I found that Westleys Bleche White tire cleaner did a good job of keeping the aluminum clean.
If you are trying to maintain a polished surface, you can use wax to extend the shine a little, but in reality, the aluminum oxidizes very fast and to keep it looking very shiny you'll need to re-polish each year (Just the final smallest grit).
Rob
Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...