How can I make my concrete white again?

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How to Make Discolored Concrete White Again Wet down the concrete with a hose or bucket of water. This helps the baking soda stick to the surface. Pour baking soda over all of discolored areas. Lightly moisten the baking soda to form a paste. Allow the baking soda paste to sit on the concrete overnight. Apply vinegar or bleach to the discolored areas.
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