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Removing Efflorescence

Removing efflorescence can usually be done by pressure washing with water or scrubbing with a brush and rinsing. The water will dissolve most of the salts but must be rinsed away completely. Some efflorescence requires alternative methods of removal, especially if it's been there a while and has crystallized. Most of these tougher deposits can be removed with specialized concrete cleaning products.

Washing with an acid solution will also work. But acid washing with diluted muriatic acid should only be used as a last resort because it will etch away some of the cementitious material on the surface. Muriatic acid should be diluted to 1 part acid and 12 parts water. After acid washing, the surface needs to be neutralized with a solution of baking soda or diluted household ammonia. This will stop the acid from attacking the material any further.

Take proper precautions when messing with acid. Wear safety goggles, rubber gloves, and cover all bare skin. Always pour acid into water, never water into acid.

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Preventing Efflorescence