What about trying Evapo-Rust. It is an environmentally friendly product that works well. You could try it on a small area. You will have to soak it, so you could rig up a pvc pipe with a cap on one end to hold it. It's not cheap; our machinists club buys it in 5-gal buckets. You might need a gal and it is totally reusable. Just an idea.


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