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Originally Posted by Mugsfull
I use oxyclean and hot water in a Cooler overnight. It removes all the labels (except Heinekin) and if there was any nasties in the bottles, those float out too.
Now, I have a water softner. My neighbor does not. He did the same thing and his bottles came out coated in some kind of white residue. It was strange. I'm guessing it was the hard water.
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Yes, that happens if you leave it too long in a hard water oxyclean solution. It can be removed with most acids - vinegar, CLR, muriatic acid, and even Star San - though Star San can also cause the same thing to happen because the phosphoric acid precipitates calcium.