Like said above get a cup wire brush, they make them for drills and grinders that will clean it up enough. Then vacuum the dust out. Clean with a wax removal solvent then prime and paint with rustproof paint.
Por-15 rust preventer. Some of their products go right over slight rust without loose stuff.
It’s legit, we use it on trailers and whatnot here with road salt all winter and it works.
Be cautious though, it’s 10x more permanent than a tattoo on skin or any surface. Buy some acetone to wash your hands before it dries, and a box of heavy rubber gloves.
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