EIFS specialized cleaning requires gentle methods to protect the thin acrylic finish and multi-layer system from damage. Use a soft-bristle brush or sponge with mild detergent (like dish soap) mixed in warm water, scrubbing lightly in circular motions from bottom to top, followed by a low-pressure garden hose rinse (under 200 PSI) to avoid forcing water behind the insulation. For mold or algae, apply a diluted white vinegar solution (1:3 with water), let it sit 10-15 minutes, then rinse thoroughly—never use bleach, ammonia, or high-pressure washers, which strip coatings and cause moisture intrusion. Professionals in Norfolk, VA, often handle this for commercial properties to ensure longevity and compliance with manufacturer guidelines like those from Dryvit or Sto.