Sometimes, if the galvanizing isn't in too bad of shape, you can really clean up the parts and hardware with some mild sand blasting. I use a hand held Speedblaster and a shale based media that I screen through a house screen. Most medias will work, I'm sure. I only use about 30 pounds of air pressure for doing this.
Here are some pics of the lug bolts that I just lightly blasted, then went over them with a hand held wire brush. The lugs had paint and dark staining on them. These are early Mopar lugs for use on my Gard'n Mast'r tractor. They went from ugly, to blasted, to buffed with a wire brush, and look new again. Some light oil or even clear coat should keep them looking good.
Freshening up galvanized parts.
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