How to Powerwash Stucco Stucco exteriors are long-lasting and fairly easy to maintain, making stucco a popular choice for nonwood frame structures. Unfortunately, stucco is prone to mold and it tends to show dirt, which often splashes onto the siding during rain. Pressure washing is an easy way to clean this type of building exterior and it’s also recommended prior to painting. But it’s important to follow the proper steps when power washing stucco, because it’s easy to damage the surface if improper methods are used. When cleaning stucco, it’s best to use a power washer with a PSI (pounds per square inch) of 1200 to 1500 for painted siding. If the intention is to clean the wall in preparation for painting or if you’re pressure washing unpainted stucco, a PSI of 2500 can work well. 1) Remove any lawn furniture, signs and other items that are located against the stucco wall(s) that will be cleaned. If necessary, use bungee cords or twine to gather the stalks/leaves of foundation plantings within close proximity to the wall. This is only necessary for certain types of plants, like decorative grasses or small stalks of decorative bamboo. 2) Apply stucco patching mixture with a putty knife to holes or cracks in the stucco. Patching must be performed before stucco is power washed; otherwise, water can seep between the layer of stucco and the underlying surface, leading to disintegration. 3) Allow the stucco patches to set and dry. This may take anywhere from 24 to 48 hours, depending on the product. Check the product packaging for information on drying time. 4) Rinse the wall with a normal garden hose to remove superficial dirt; this will lessen the chance of eye injury and it will allow for effective pre-treatment of the stucco exterior. 5) Mix 1 part bleach and 3 parts water in a bucket, don rubber gloves and sponge the solution onto the stucco as a pre-treatment for areas of mold or heavily soiled areas. Allow the solution to sit for at least 30 minutes before proceeding. 6) Attach the garden hose (while the water supply is off) to the power washer. The water attachment port is usually clearly labeled; it’s usually located...Read More
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