The front porch of my home faces to the north. When it rains the concrete gets a line of a white chrystaline substance next to an expansion joint. There is a water or at least it look like a water stain there.
Can you tell me what this stuff is and how to get rid of it so it won't come back.
I should mention also that it goes away on it's own but always comes back when it rains. I'm thinking some kind of mold or other fungus. Any concrete people know what this is? Thanks in advance.
U.S.M.C. Semper Fi !!!
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