wrote in message
oups.com...
Thanks for trying to assist but I know about sulphuric acid.
.............
It's sodium carbonate dissolved in water in plastic container. Connect
a car battery to the object to be de rusted and the other wire to a
stainless steel anode in the water.


Really - you know all about sulphuric acid and that it's sodium carbonate
dissolved in water. That's a new one on me - on both counts!