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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.

Solid, unpainted stucco shouldn’t suffer damage from dots of glue used for this task. If the stucco is dirty, you may notice slight marks when you heat and peel the glue away, but these aren’t permanent.

However, not all stucco walls are solid stucco. Some are “faux” stucco with a foam backing. This kind of stucco veneer is more susceptible to damage, including damage from hot glue. We don’t suggest attaching anything to these kinds of stucco walls, so make sure you check the stucco type before starting this project.

You should aim to let stucco dry for at least 48 hours before it rains. While misting new stucco and keeping it moderately moist is important for strength and longevity, uncontrolled exposure to rain can lead to weak stucco that doesn’t bond properly. Rain can also affect the stucco finish and the color unevenly, leaving you with less appealing siding.

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.