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Depending on how bad the surface rust is, perhaps dip a rag in EvapoRust and lay in the affected area. I have had good results on overnight flash rust by just wiping down with a EvapoRust soaked rag. Regardless of treatment, key question is how to protect after rust removal.



Agreed, a liquid rust treat is the way to go in tight areas.
I think I would then use paint either spray or maybe dab/brush and let gravity flow it in.