How to Remove Efflorescence from Concrete Block Walls. Web Step 4: Clean with muriatic acid and water. Remove stubborn efflorescence with a solution of muriatic acid and water. A solution of 1 part muriatic acid to 12 parts water is quite good for efflorescence removal. Pre-soak the wall with fresh water and then.
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Web The easiest step to remove efflorescence is to wash the wall and scrub.