After another overnight soak and wire brushing, here's what the worst rusted part looks like:
Some of the pits/pores are clean all the way to the bottom. But you can still see a lot that have rust in the bottom. It's back in the solution again now. Thinking of trying something new... Krud Kutter "Must for Rust" is the product I"m pondering next. It's harsher than the oxalic acid so I need to be sure I won't get interrupted when using it.
In a crazy world, it's the crazy man who can get by - and it's about to get cray-cray up in here.