Rust Chek rust converter. I used in on my Jeep hitch. Get the bottle instead of the spray and brush it on. Remove the flaky stuff first with a wire brush.
Shewie, where do you get naval jelly in canada anymore?
I found a picture of the test with the vinegar soak FWIW
The piece of metal was partly immersed twice as the "L" shape indicates. It was all the same rusty brown to start.
White vinegar, salt and lemon juice concoction....strips rust off like nuts.