Power washing is exterior cleaning of siding, decks, patios, driveways, walkways, and fences — removing dirt, algae, mildew, moss, and the green and black streaking that builds up on the shaded side of a house. The important part is that not every surface gets the same treatment. Concrete flatwork like driveways and patios can take high pressure, and we use a surface cleaner so you get an even result instead of wand stripes. Siding, roofs, cedar, and older brick get soft washing instead: low pressure plus a cleaning solution that kills the organic growth. High pressure on those surfaces forces water behind the siding, splinters wood, strips shingle granules, and can blow mortar out of joints.