How to Prep Your Home for a Power Washing

To prep your home for a power washing, close all windows and doors, cover outdoor outlets and light fixtures, move furniture and grills away from the walls, and note any surfaces that need low pressure. Water forced into an open window or an outlet causes real damage, so sealing up comes first. Delicate spots like vinyl siding, wood, and stucco need a soft, low-pressure wash. A little prep keeps the job safe and gets the surfaces clean without harm. Here is how to get ready.

Close and Cover Before Water Hits

Start by shutting every window and door and covering exterior outlets, light fixtures, and vents. Water under pressure will find any gap, and an open window or a live outlet is a real hazard. Tape plastic over fixtures that could let water in. Check that weatherstripping is intact. This first step protects the inside of your home and your wiring.

Clear the Area Around the House

Move patio furniture, grills, planters, and anything loose several feet away from the walls being washed. Overspray and runoff carry cleaner and grime, and you do not want that on your furniture. Clearing the area also gives the crew room to work safely. Cover nearby plants you want to protect. A clear perimeter makes the whole job faster.

Know Which Surfaces Need Low Pressure

Point out any vinyl siding, wood, stucco, or older surfaces, because these need a soft wash instead of high pressure. High pressure can crack siding, gouge wood, and force water behind walls. Concrete and brick can take more force, but a house exterior usually cannot. Matching pressure to the surface prevents damage. Our power washing service sets the method to each surface across Austin.

Handle Mildew and Stains the Right Way

Green and black streaks are usually mildew, and they need a cleaning solution and dwell time, not just more pressure. Blasting mildew with high pressure damages the surface and often leaves roots behind. A proper soft wash with cleaner kills growth and rinses it clean. North-facing and shaded walls grow the most. Treating it right keeps it from coming back fast.

Why Wash Before You Paint

If a paint job is coming, washing first is one of the most important steps, because paint will not bond over dirt, chalk, or mildew. A clean surface lets primer and paint grip and last. Skipping the wash is a common reason a fresh coat peels early. Washing pairs directly with exterior painting. For more on reading paint problems, see our post on exterior paint failure.

Written by the Mellados Painters team. Updated 2026-07-24.