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I don't have an answer for you, but I too am looking for an answer to this question. My lawn sprinklers have been spraying on my concrete walls and leaving a white residue on the wall. Im not sure if this is calcium or what it is, but was looking for a good way to clean it up.

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10y ago
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15y ago

For chlorine to deposit on something it needs to be solid; that doesn't occur until -102oC/-151oF. So assuming the brick was actually that cold, the easiest way would be to slightly warm the brick to above that temperature in an extremely well-ventilated area and allow the now-gaseous chlorine to drift away.

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Q: How do you REMOVE calcium deposits left on bricks from WATER OVERSPRAY?
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