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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.

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.

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.

It’s not advisable to use CLR on stucco. CLR is a powerful acidic cleaner designed for removing tough mineral stains. Stucco is a porous material commonly made of cement, lime, and sand. The acidic nature of CLR can potentially damage or etch the stucco surface, leading to discoloration or deterioration. 

It is best to use cleaning solutions specifically formulated for stucco or mild household cleaners mixed with water to clean stucco siding. Always test any cleaning product in a small, inconspicuous area before applying it to the entire stucco surface.