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Efflorescence is the stubborn problem that has caused confusion and trouble for masonry since the first time it appeared thousands of years ago on ancient masonry walls. Efflorescence is normally the white, powdery scum that can appear on masonry walls after construction but can also be brown green or yellow, depending on the type of salts.
As moisture evaporates into the air, it leaves any mineral deposits carried with it behind, which forms a salt-like coating on the concrete. The ugly white powdery buildup is the efflorescence you see on your basement walls is that mineral salt. How to Clean Efflorescence Removing efflorescence is finest carried out with a power washer -- you can obtain a single at a nearby hardware store.