Strip down complete, and at least a thousand YouTube videos later, I experimented with different ways to manage rust removal. Small parts seemed OK with a wire brush, elbow grease - a soaking in white vinegar seemed to help in advance. But that wasn’t feasible for other, bigger parts. I read about the electrolysis method and set about putting something together. After a little trial an error to find the right materials for the sacrificial anode(s) and crocodile clips to manage connections, I have to say I have been impressed with the results.
After treatment for 24hr or so, most rust is removed from most pieces. Line of sight between the rusty parts and the anode helps, so I had to add further anodes, but with a production line set up, I have quickly managed to get through all the small and medium sized parts. Each needs a wash, wire brush, a wet & dry paper rub down and thorough drying time afterwards, but I definitely feel like early progress has been made. Many of the parts need to be painted afterwards so I have wrapped them all in paper and put them in bags to protect them from developing surface rust, before moving onto the painting phase a little later.
I ended up with a big 50L tub (old beer brewing kit) and two smaller 10L boxes for smaller parts. I had to buy an older car battery charger (newer ones don’t like the process because they normally have ‘smart’ sensors to monitor charging. I also set up a very Heath Robinson spike board to accommodate the multiple crocodile clips in my circuits. Seemed to work well.