How to Clean Stucco and Stone Exteriors

Stucco

• Pressure-washing: A pressure washer won’t harm stucco that’s in good repair, but it will blast away any loose paint that’s applied to areas near your stucco. For mold and mildew, use a commercial mildew remover or a solution of one part bleach to three parts water. Use trisodium phosphate (TSP) or laundry detergent for ordinary grime, or combine either detergent or TSP with bleach. Rinse well.
• Handwashing: To protect paint or other delicate finishing materials, you may prefer to wash stucco by hand. Use a bleach solution for mildew, a detergent solution for grime, or a combination of the two. Wet the stucco first, then scrub with long strokes with a natural-fiber brush, working from the bottom to the top to avoid streaks. Replace your wash water as soon as it becomes dirty, and rinse well with a garden hose before the walls dry.

Stone