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Problem with galvanized metal is erosion, of the zinc it kinda looks like white powder stains. The only way to get it looking like new is to replate it. Sanding makes it look worst, and any kind of galvanized paint will never flow right, making it look horrible. I dont have an easy solution for ya, but I would try to use vinegar with 800 grit wet sand paper, dont sand in a circular motion, try left to right or up and down, let it sit. than clean it and see what it looks like. you might have some success. See how it goes.
Thanks to all comments. That is about what I have found after trying several methods. I figured it would be pointless to spend a lot on cleaning solutions...
I suggest ya clean/scuff, prime and paint them or have them powdercoated... a few guys in here have gone with hammertone silver powder and its looks great. For me, I like basic semi-gloss black... I used an engine paint cuz it'll hold up better to oils, brake fluids, and light solvents if wiped up quickly. $0.05.
I went with what Mike posted above for color. To clean I used a bucket of dawn dish soap in hot water and a red sctochbrite pad and scrubbed it clean, seemed to work well for me.
Here you go, well sort of galvanized looking. As per the FTE user words.
"I used Rustoleum Industrial Aluminum spray paint, comes in a 33% more can. Used less than half can to do inner fenders for around $12 a can, the primer is about $8. It dries really fast, goes on thick, and never gets runs. I used Rustoleum Industrial spray paint for everything. I have painted all kinds of things like the fire walls on a 68 cougar xr7, 1956 ford, 1955 ford Crown Victoria, numerous parts, and a whole van for a friend.
It goes on really good with one coat, lots of coverage, 2nd coat has to be within an hour, or after 48 or something, I just do 1 coat. I tried other spray paint, but this is my favorite, for a rattle can job anyways. It's enamel, so it takes long time to cure. It does dull, and in a year I do expect to see rust coming out again, from Acklands Grainger.