This Danbury, CT residential property features an expansive front entryway constructed of poured concrete steps and connecting aggregate walkway pavers. Due to heavy canopy shade from mature maple and oak trees on the northern exposure, the concrete had developed a thick, slick coating of organic green algae and deeply rooted black lichen colonies. During rainy weather, the steps presented an immediate slip hazard for the homeowner and guests.
Our crew began by inspecting the perimeter landscaping and foundation plantings, thoroughly pre-wetting all surrounding shrubbery and turf to protect root systems from cleaning solution contact. We applied a specialized, surface-safe organic pretreatment to break the chemical bond between the porous concrete aggregate and the embedded microbial growth. Once the surfactant achieved complete dwell time, we utilized commercial 20-inch rotary surface cleaners operating at a regulated 2,800 PSI. This approach delivers uniform water distribution without creating the unsightly wand lines, etch marks, or joint blowout common with high-pressure consumer equipment.
After deep washing, every step riser, tread, and paver edge was detail-rinsed with wide-angle fan tips to wash all suspended silt toward designated turf drainage areas. We concluded with a mild post-treatment neutralizing wash designed to retard microbial spore return. The completed project restored the concrete’s original bright, clean aesthetic and ensured safe, slip-resistant footing for the entire property approach.