Rust-salt crust removal

Removing rust from the body structure crevices where the body to stub mounts are. This area is semi-exposed and this became filled with road debris. Since the car lived its life in SASK and Alberta, I assume it was exposed to a few rounds of salt. Not much exposure, so no severe damage, but even just once is too much, in my opinion.

I'm trying to remove all of the rust and paint it. Been soaking in Evapo-Rust, Naval Jelly (Phosphoric acid), even HCL here and there but this crust is super...

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Author: 73Coupe