Pressure strips things
Washing a driveway is satisfying and hard to ruin. Stucco and old redwood are another matter. A tip held too close cuts lines into the finish that no amount of rinsing puts back, and on painted siding you end up repainting the wall you meant to clean. We drop the pressure and let the soap work on anything soft. Mineral-heavy tap water bakes scale onto concrete and glass, so those spots get a cleaner rather than more pressure. Roofs we leave alone. Pressure on tile or composition forces water up under the courses, and the leak shows up in a bedroom ceiling two storms later.





