September 17, 2013
It depends. If you're trying to clean the surface I would steer clear of Muriatic Acid and use a patio wash or perhaps an oxygen bleach like Oxy Clean. If you need to brighten the surface, here are the directions from the Muriatic Acid label: "Wear chemical-resistant gloves and chemical splash goggles. Remove all surface oil, grease, and dirt prior to using this product. BRIGHTENING CONCRETE, MASONRY, BRICK, STONE, GROUT AND HARD SURFACES: Dilute 12 ounces of Safer Muriatic Acid per gallon of water in a plastic sprinkling can or a plastic pump up sprayer. Gently stir with a non-metallic utensil. Apply evenly and spread with a broom to any missed areas. Allow to sit for 5 minutes. Then rinse thoroughly with water."
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