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  Cromar AlphaChem Mortar Stain Remover is a rapid, concentrated hydrochloric acid‐based formula for dissolving cement and mortar stains on brickwork, concrete, paving and render. It can also be used for removing efflorescence. Preparation and   For more information on Cromer, please visit their website here. For other concrete related products, click here. For primers and cleaners, please click here.