In most cases, you can use a simple garden hose to gently wash away dirt and debris. Whatever doesn’t come off can be lightly scrubbed away with hot water, dish soap, and a nylon brush. For heavier cleaning jobs, you may want to consider hiring a professional. If using a pressure washer DO NOT exceed 1400psi and use a 40 degree fan tip, with the end of the wand 2’ from the stucco surface. Also never use a product like TSP (tri-sodium phosphate). Phosphate will break down the stucco.