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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.

Homeowners insurance generally won’t cover stucco damage unless it’s caused by a covered event like a storm or fire. You’ll need to pay out of pocket for damage caused by age, wear and tear, lack of maintenance, or faulty installation. Consult your policy for the specifics of what stucco damage is covered and what isn’t.

All of the components of stucco are non-combustible, so the siding material won’t ignite or spread fire to the interior of your home. However, it also expands and contracts with changes in temperature, so it will crack from long exposure to heat. Eventually, fire will spread through those cracks. Still, stucco is one of the best siding materials for fire protection and can keep you and your family safe for an hour, on average.

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.