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.

This actually has nothing to do with car batteries, does it?

Are you asking a question about electrolysis?

-- JJ