Clean stucco surfaces carefully.
Stucco is a composite cladding material made from Portland cement, sand, lime and water. Often used for building exteriors, it can be a durable, attractive surface. Stucco is porous and has lots of crevices where mildew can grow if there's too much humidity and a lack of light and air circulation. Clean stucco exteriors, but don't forget to address the conditions that allow mildew to develop.
Instructions
1. Remove any yard furniture from the immediate area. Spread a plastic tarp over plants and shrubs near the stucco wall.
2. Attach a jet nozzle to the garden hose. Wet the stucco wall, working from the bottom to the top, standing several feet from the wall. Wetting from the bottom will prevent dirt from washing down and absorbing into dry stucco as it runs off.
3. Attach a garden sprayer attachment to the hose. Put on safety glasses. Fill the sprayer with household bleach. Spray a wide-angled spray on the mildewed stucco and let it sit for 15 minutes.
4. Remove the sprayer and reattach the jet attachment. Spray a rinse of water to remove remaining mold and residue from the stucco, working from the top to the bottom.
5. Prune back surrounding vegetation that may be keeping air and light from reaching the stucco surface. Plenty of sun and free air movement are the best ways to prevent mold and mildew from returning.
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