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I had to help my son in law flush and change his leaking radiator `01 mustang, it`s a v6, so here in Calif, you cannot buy any rad flush thats stronger than toothpaste, and his needed flushing badly, so spent 2hr running the car with the hose connected, then I had him put 2 gallon of white vinegar in and had him leave it four days, we dumped it out and flushed again with it running til it ran clear, everything is clean, changed the radiator and filled with prestone, he` had never changed fluids he just added water so it was some nasty rust....