Luther, won't work.
The crud clogging the rad is aluminum phosphate corrosion, most likely
(unless you are really lucky and it's only carbonate and will clean out
LONG soaking in citric acid). Aluminum phosphate deposits are pretty
much impossible to remove when accessable, let along inside the rad
tubes.
On top of that, if you DO clean then out, it's almost a certainty that
the rad will leak shortly.
Get a new one, you will eventually crack the head if you don't and
that's MUCH more bother and expense.
Peter
