RadonSeal Efflorescence Cleaner breaks down and removes efflorescence, mineral deposits, mold and mildew, and lime deposits from concrete, bricks and other masonry surfaces. Dissolves and oxidizes - makes efflorescence disappear! Much safer and easier than hazardous acids. Also kills molds and mildew on contact. Leaves no residue. TYPICAL CLEANING APPLICATIONS: Poured concrete, concrete blocks, bricks, stucco, pavers, and man-made stones. RadonSeal Efflorescence Cleaner emulsifies, reacts with, and removes: efflorescence, lime deposits, metal salt stains, molds and mildew.TYPICAL BRICK/CONCRETE PROJECTS: exterior brick walls, chimneys, pavers in pool deck or patios, basement walls and floors, foundation slabs brick fireplaces restoration or renovation of older buildings or structures, kills molds and mildew in damp or musty basements cleans laitance on new concrete, and stone monuments. PREPARATION: Remove paint, and any oil deposits with a dishwashing liquid (Dawn), detergents, or degreasers. The concrete or brick surface must be completely dry. Cover all other objects like fixtures, windows, metallic frames, and plants to protect them against over-spray.APPLICATION: Mix the Efflorescence Cleaner with the included mixing tool. Mix for about 5 minutes, letting it settle when it foams up. Mix or shake also between applications. Apply the cleaner with a low-pressure sprayer or a brush. Preferably, use a sprayer made entirely of polyethylene ("Roundup") or stainless steel to avoid gradual degradation of parts. Allow the concrete cleaner to react and emulsify the deposits. While still wet, re-spray heavily effloresced areas. If needed, vigorously scrub heavy deposits with a stainless steel wire brush. Just let the surface dry and if necessary, sweep it clean. Avoid applying water, which would re-activate efflorescence inside the concrete or mortar.COVERAGE: Approximately 500 sq. ft. Heavy deposits may require a second application.