I received this URL from another, non-automotive list. It sounds like a very 
effective way to completely remove JUST the rust (without removing any 
non-rusted metal) from parts small enough to fit into a 5 gallon bucket or 
small trash can. I suppose it could be up-sized to work on an entire MGB 
body, assuming you can find a large enough plastic container. You could 
use a flattened Miata for the anode (note: flattened cats will not work -- 
must be made of steel).
http://users.interconnect.net/nlindsey/Electrolysis/Electrolysis.htm
Regards,
Jerry
 
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