I apologize for my erroneous statement.  I reviewed aluminum and hydroxides after reading other answers.  They are correct.  Copper radiator -- probably ok.  DMc

---- Dave Mcneely <mcneely4@COX.NET> wrote:
> ---- Mark Dearing <VWBrain@AOL.COM> wrote:
>
> > am  trying to find a way to get the radiator soaked into something that
> > would lift  the slime from the inside of it,
>
> > hey guys  we have used draino on these and heater cores without any
> > problems.  normally we let them soak for a couple of days.  these were  done this
> > way because the customers couldn't afford to fix them  right.    So far none
> > of them that was fixed this way have had  any problems  later  mark dearing
>
> Draino is lye.  Cheaper if you buy a product by its generic rather than specialty brand name.   Should work, depending on what the "slime" is.  Not so hard on metals as any acid would be, but also will not dissolve lime deposits.
> --
> David McNeely

--
David McNeely