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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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