In a pinch last winter I used some of this radiator stop-leak. I'm currently replacing the water pump, thermostat, expansion tank and all hoses.

I'd really like to flush the radiator and transmission cooler to get any and all remnants of the stop-leak out.

What can I flush with to ensure that?

On a past vehicle I used Restore and Restore Plus with great results but wasn't sure if an acid & alkaline based flush product would be OK to use on a N62.