Ive run out of oxalic acid and i had pair of forks that i needed to run through the process. My Mrs told me to try HP BROWN SAUCE.
I put it all over the rusty area and left over night.
Just came downstairs and run the unsharp edge of a knife over the area and it came off like butter from a knife. Just came off and it was as rusty as fook!
Give it ago. A much cheaper, quicker and easier way in my opinion and i love a bit of acid!
..................................and brown sause!