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I have had better luck with evaporust than vinegar. Also will never use distilled water with water wetter again. 40-50 years ago I remember using Macs #13 after rebuilding an engine that had been cleaned in caustic soda to prevent future rust problems. I always had excellent results with Mac's #13, drained a few days later and refilled with 50/50 antifreeze. I don't know if Mac's Anti-rust is the same formula as the old Mac's #13 that looked like milk.