[alga]

+1 for electrolysis from me, too. I did wirebrush parts I could not dip into the electrolyte: gearbox, bellhousing, engine block, halfshafts. I electrolised callipers, disks, drums, hubs, bearing carriers, drum backplates. On convoluted surfaces with nooks and crannies, and especially the pitting from rust, you cannot get all the rust out with a wirebrush.

The main downsides to electrolysis are: 1) you have to strip everything to bits (whereas you can grit blast complete front hubs , or, perhaps, callipers, without taking them apart), 2) as soon as you take the part from electrolyte, wash and wipe it, surface rust starts to appear, largely due to metallic iron dust reduced from rust by electrolysis. Literally, you take out a part from the bath, it's black. You wash it, wipe it off, its gray. Next day it's chocolate brown. So, with electrolysis you have to paint ASAP or oil the surface if you plan to paint later.