Martin wrote:

Can anyone identify these deposits, and recommend a treatment? Is

Are Holt's products available? They do have a radiator cleaner in their
line (name fell out of my brain).
Chances are, that you need their "rad weld" afterwards. :-)

Nick
--
Motormodelle / Engine Models:
http://www.motor-manufaktur.de
Ellwe 2FB * VTM 87 * DLM-S3a * cubic
more to come ...