How Much Do You Really Know About Your Driveway?

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That white, powdery stuff on concrete walls usually comes from:

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Correct Incorrect Efflorescence happens when water moves through concrete and pulls soluble salts to the surface, where they dry into a white powder.

That white, powdery stuff on concrete walls usually comes from:

• Bird droppings
• Salt carried by moisture
• Old paint
• Dirt buildup