Radiator cleaning - economically of course!

[Speedex750]

Thanks to all for the responses.

I like the simplicity of starting with a flush to sweep out anything loose then following up with a descaling compound. It sounds like a Fernox product is the way to go, both for a descale and then as a running coolant. I'm not bothered about resisting freezing, my record low in the garage was still above freezing, just, - it's the corrosion inhibitor, that anti freeze normally provides, that I want.

The engine is currently in bits so I can get most of the loose stuff out and do the radiator statically on the floor. I like Charles's simple tank set up and may try that when the engine goes back in.

Thanks for your help, Dave