From my research on this method, the best common chemical to use is
sodium carbonate, the main ingredient of washing soda. No one around
here carries it, so I went looking for other common products.
Here's a nice gov. site to check out the ingredients of common
A search for sodium carbonate turned up quite a number of hits. Arm &
Hammer Fabricare is sufficient (75-85% solution), but there was an
even better one: Prestone HD Cooling system Cleaner, at 90-98%. Should
be more readily available than washing soda, and a better conductor.
If I get some and try it out I'll post something.