I have found that naval jelly requires a good amount of elbow grease with a bristle brush or more to get anything more than very light rust off.

On this topic, what does the collected wisdom recommend for smaller pieces, like cladding screws and things, that are starting to get a bit of rust, or maybe have more than a bit? I seem to recall someone soaking their small bits and pieces overnight in a chemical before applying a rust stop type coating and paint. Might be useful for Tri's application as well.