Aluminum Utility Trailers Questions About A Utility Trailer, Please Help?

Questions about a utility trailer, please help? - aluminum utility trailers

In the attempt to completely redo my trailer and snowmobiles only benefit supporters. I think it is aluminum and has caused the damage caused by road salt, it is very old. What is the best way to get this trailer the best that can be? How can I clean? Step by step please .. thak you guys (and girls)