Picked a great day for a coolant flush, but definitely needed it.
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Prestone flush in the fluid for a 2hr drive.
Good flush and backflush with the hose.
Another chrmical flush and distilled water for 45 min.
Also did the thermostat and discovered it was not OEM and had no passthrough valve (or whatever it is called) for constant flow.
3 more hour cycles with just distilled... Never came out clear but a huge improvement from where it was. I'm now idling at 181 compared to 195.
Went with Prestone green 50/50 premix. I think this cooling system has had too rough of a life to Transition back to red.