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Yes, you can screw directly into stucco. Only do so if the item you are installing is a permanent fixture. Drill a pilot hole into the stucco using a masonry or concrete bit, then drive in the screw with a power drill or screwdriver.

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.

To repair damaged exterior stucco, you’ll first remove all loose and crumbling material from the damaged area. You then need to thoroughly clean the area and dampen it to ensure proper bonding. After that, you’ll apply a bonding agent to the repair area, then apply new stucco in layers, allowing for curing time between each layer. The final coat should be textured to match the surrounding stucco pattern as closely as possible. Once fully cured, the repaired area can be painted to match the rest of the wall if needed.

German schmear is a durable brick masonry coating. It should last at least a decade or two without flaking or fading, even with minimal maintenance. This makes it an economical option compared to the cost of painting your house exterior, which usually needs to be repainted every five to 10 years to keep it looking its best—thus costing more over the same time period.