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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.

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.

When hiring for your project, look for licensed, insured contractors with experience in stucco removal. Ask them for references, review their past stucco removal projects, and request detailed, written estimates. A reputable stucco removal contractor will explain the entire process, outline all costs, and ensure proper disposal and compliance with local codes.

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.