Pouring a concrete driveway, walkway or patio can be messy. Even if you lay up protection, such as drop cloths or building paper, wet concrete can splatter on adjacent surfaces. Attempting to scrape off dried concrete can damage siding, doors and painted finishes. Professionals use a procedure that dissolves dried concrete without leaving scratches or discoloration.
Wet the ares of dried concrete, using fresh water and a garden hose. Protect the surrounding surface area with plastic drop cloths.
Put on work gloves, safety glasses and a respirator mask. Pour five parts fresh water into an all-plastic 5-gallon bucket. Carefully add one part acid-based masonry- or concrete-cleaning solution. Refer to the label on the container to determine the amount of solution per part. Always add acid to water; never add water to acid, which can create an explosive reaction.
Dip a stiff-bristle nylon brush in the prepared solution and apply a generous amount onto areas where you want to dissolve concrete. Scrub the surface with the brush to dissolve and remove the concrete.
Repeat the procedure, as necessary, until the desired result is obtained. Rinse the cleaned areas with fresh water and remove the drop cloths.