Quote:
Originally Posted by hatzie
CLR used to contain phosphoric acid and Citric Acid. Not sure what it contains now that it's "Phosphate free" but I bet it's still a mild acid.
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I'm curious about the acid. It seems to me, that any acid wouldn't matter because it simply wouldn't be there long enough. Or would it? It seems like it would just be flushed back out or neutralized when you finally thoroughly flushed the radiator again, with the garden hose.