It uses high-pressure water (sometimes with detergents or chemicals) to remove dirt, grime, mold, algae, mildew, and stains from exterior surfaces like driveways, sidewalks, decks, siding, fences, roofs (via soft washing), and more.

It can be if done correctly by professionals who adjust PSI (pounds per square inch), use the right nozzles, and apply proper techniques. Too much pressure can damage wood, strip paint, harm shingles, or crack surfaces. Pros protect landscaping, windows (often washed separately at low/no pressure), and other areas.

Pricing varies widely by job size, surface type, difficulty, and whether chemicals are used.

It varies by location, climate, and exposure (e.g., more often in humid or rainy areas with heavy mold/algae growth). Homes typically benefit from exterior washing every 1–2 years, roofs every 3–5 years, and driveways/patios as needed (every 1–3 years). Commercial properties may need more frequent service.

Many providers handle both residential and commercial work, such as cleaning storefronts, parking lots, sidewalks, or building exteriors.

Keep them away during the job due to high-pressure spray risks. After rinsing, most areas are safe once dry, though chemical soft washing may require extra precautions or rinsing of nearby plants.