I would suggest pulling the upper radiator hose, sticking a garden hose in the radiator and running the engine til what comes out is clear. Do a flush with commercially available solution. Reflush with distilled water. Then refill with your engine and radiator with the 50/50 distilled water and antifreeze mix.
I would only use vinegar as a last resort. I had to use vinegar to get the dex-cool out of my cars radiator and coolant bottle. I also flushed the heater core with it. As an acid, I am sure it is not safe to leave in. As I have an aluminum engine, this was pretty risky.
I tried several things before trying vinegar. It was the only thing I could find that cleaned the Dex-goo out of the coolant bottle. I followed with Peak engine flush leaving it in several days, draining, flushing and refilling with antifreeze.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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