Remove dirt, mildew, and other debris to refresh the look of stucco.
Stucco, an environmentally friendly building material typically composed of limestone, concrete, and sand, is commonly selected for exterior walls of homes and garden enclosures due to its distinctive texture, setting it apart from alternatives like vinyl siding and brick. Nonetheless, its porous nature and uneven surface make it prone to accumulating dirt, mold, and mildew. Consequently, it is crucial to routinely sanitize and cleanse stucco to maintain its integrity and appearance.
How Often to Clean Stucco
Because of stucco’s textured and porous nature, it swiftly collects dirt, mold, and mildew, necessitating regular cleaning to uphold the home’s aesthetic appeal. Ideally, stucco surfaces should undergo cleaning two to three times annually, although once a year suffices for most residences.
Materials Needed
- Hose
- Pressure washer
- Low-pressure spray tip nozzle
- Caulking gun
- Spray bottle
- Safety goggles
- Protective gloves
- Respiratory protection mask
- Soft-bristle brush
- Bucket
How to Clean Stucco
Inspect and Repair the Stucco Surface
Prior to cleaning the stucco, it’s essential to conduct a thorough inspection of the surface to identify any chips, cracks, or breaks. Water infiltration through these openings can lead to mold and mildew growth within the walls. Small cracks and chips can be addressed with exterior acrylic caulking, effectively sealing the porous interior against water intrusion. However, significant damage such as large cracks and crevices should be addressed by a professional.
While inspecting, be vigilant for signs of mold, mildew, or algae growth on the stucco surface. Mold and mildew typically manifest as black stains, while algae imparts a green hue. These growths necessitate treatment with bleach or borax to eradicate them and prevent further proliferation.
Prepare the Cleaning Solution
Several cleaning solutions are effective for removing dirt and grime from stucco surfaces. Optimal results can be achieved with a concentrated exterior cleaner designed explicitly for outdoor use. Such solutions typically combine cleaning and disinfecting properties, although some may require dilution with water and bleach for thorough elimination of mold, mildew, and algae growth. Always adhere to the manufacturer’s instructions for proper dilution of concentrated exterior cleaner.
Alternatively, a mixture of one cup of liquid bleach and one gallon of water can effectively remove mold, mildew, and algae stains, though it may be less effective against dirt and grime. For those averse to using bleach, a combination of borax and dish soap is a suitable alternative. Mix 1/2 cup of borax, two tablespoons of dish soap, and two gallons of hot water.
Transfer the selected solution into a spray bottle for convenient application on the stucco surface.
WARNING: Mixing certain cleaning chemicals can produce hazardous compounds. Always follow the manufacturer’s mixing guidelines for the cleaning product being used. If unsure, opt for a different method.
Apply the Cleaning Solution
Using a power washer or garden hose equipped with a spray nozzle, saturate the stucco surface thoroughly. If employing a power washer, ensure it is set to the lowest water pressure setting and equipped with a low-pressure spray tip nozzle. This initial step aims to moisten the wall, making excessive pressure unnecessary. Additionally, position the power washer at a 45-degree angle and maintain a distance of at least two feet from the stucco surface to prevent damage.
Next, apply the prepared cleaning solution onto one section of the wall, ensuring even distribution across the entire area. Allow the solution to sit on the stucco for at least 10 minutes before proceeding. Stubborn stains may require up to 30 minutes of application time before scrubbing.
Scrub Stubborn Stains
For areas with persistent stains, employ a soft-bristle brush to scrub the stucco surface without causing damage. Fill a bucket with the chosen cleaning solution and dip the brush bristles into the mixture. Gently scrub the affected areas, taking care not to apply excessive force that could smooth down the stucco texture.
Alternatively, consider utilizing a powered rotating scrub brush for a less physically demanding approach to tackling tough stains.
Rinse the Stucco Surface
Once the cleaning solution has had sufficient time to loosen dirt, grime, mold, mildew, and debris, utilize the hose or power washer to rinse the stucco surface. As before, use the pressure washer on the lowest setting to prevent damage.
Commence rinsing from the top of the stucco surfaces, gradually moving downward to ensure comprehensive coverage. The cleaning solution, along with accumulated dirt and grime, should be dislodged as the water rinses the surface. Employ a horizontal back-and-forth motion with the spray of water until the entire surface is thoroughly rinsed.
Allow the stucco surface approximately 24 hours to dry completely post-cleaning. Opt for a day devoid of wind or rain to facilitate optimal drying conditions and maintain the stucco’s cleanliness.
Tips for Maintaining Stucco Cleanliness Over Time
To prevent staining and discoloration along the bottom of walls, utilize rocks, mulch, or other landscaping materials to cover the surrounding dirt around the home.
Promptly address any emerging hairline cracks by cleaning the affected area, allowing it to dry, and applying caulking for repair.
Regular cleaning is essential for preserving the color and preventing fading of painted stucco surfaces.