I just use Eastwood Rust Dissolver 12096 ( Or any rust dissolver) in a home made trough made from plastic ease trough glued together. (Make the trough big enough to fit a car door bottom as a bonus). Let it set for a few hours or over night... Then just poor it back in the jug to reuse it again. If it starts to not dissolve rust any more I just buy more. And to get rid of surface rust around paint I just mix Rust Dissolver with CLR about 50/50 and scrub it with a plastic bristle brush. Then hit it with a liquid etcher.
I really only abrasive blast large really crusty parts, or to smooth out pitted surface. Blasting is too messy and can screw up the surface.
I've attached some pics of shock plates that were soaked for an hour...
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