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When cleaning stucco siding, it is recommended to use a pressure washer with a psi (pounds per square inch) between 1,500 and 2,000. This range provides sufficient power to remove dirt and grime without causing damage to the stucco surface. It's important to avoid using excessive psi as it can chip or crack the stucco. 

Using a wider spray nozzle and keeping a safe distance of about seven to 10 feet from the siding helps ensure a gentle and effective cleaning process. Always follow the manufacturer's guidelines and adjust the psi accordingly based on the condition of your stucco and the specific requirements of your pressure washer.

Masonry screws are the best option to be used on stucco. They’re thicker and made to penetrate harder surfaces like concrete and cinder blocks. Fluted masonry screws work the best because they create a stronger grasp thanks to the lines on their shafts. If you’re working on exterior stucco, use galvanized screws to prevent corrosion.

Failing to repair damaged stucco can lead to significant problems. Cracks can grow and deepen, allowing water and moisture to get behind the stucco. This moisture intrusion can cause water damage, structural issues, and mold or mildew growth. Delaying repairs will likely cost more in the long run as the damage worsens, so it's best to repair your stucco as soon as you notice any signs of damage, such as cracks, holes, or discoloration.

One of the most significant downsides to stucco is the installation cost, which is higher than that of many other siding options because getting it to look clean and professional is a labor-intensive process. Stucco can also absorb water, making it an unsuitable option for siding in areas that see excessive rainfall. Finally, stucco can crack and chip, especially in extreme weather, and repairs are not only challenging and require help from a professional who does stucco, but can get expensive.