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Oxalic Acid


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Like other said, there are lots of products that work. I use Rust-Aid from Home Depot and it removes the hull stains in seconds. One thing to remember, most acids will etch metal (like your trailer). So, use as little as necessary, keep it off your trailer, keep a garden hose handy to spray the trailer. You will have to polish that area after using acid or the stains will appear quicker and will be more difficult to remove.

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