Tip 1: Use the Right Pressure Setting
Pressure must be matched to the surface. Vinyl siding requires 1,300–1,600 PSI; wood decks need 500–1,200 PSI; concrete driveways need 2,500–3,000 PSI. Excessive pressure causes splintering, surface etching, or water penetration behind panels. Always start low and increase gradually.
Tip 2: Choose the Right Cleaning Solution
Use vinyl-safe mold and mildew cleaners for siding, wood-specific cleaners for decks (avoid bleach on untreated wood), and degreasers for driveways. Allow solutions to sit for 5–10 minutes before rinsing to fully break down contaminants.
Tip 3: Pre-Soak Surfaces Before Washing
Pre-wetting prevents detergent from drying too quickly and protects delicate materials, particularly during sunny weather. This step also minimizes wood absorption, reduces concrete streaking, and means you'll need less pressure overall.
Tip 4: Spray in the Right Direction
For siding, apply detergent upward from bottom, then rinse downward at 45° angles to prevent streaking. Spray deck wood along the grain. Use long, sweeping passes on driveways. Never spray upward under siding panels — it forces water behind the surface and causes mold and rot.
Tip 5: Maintain the Correct Nozzle Distance
Distance controls pressure intensity. Maintain 3–4 feet from vinyl siding, 2–3 feet from wood decks, and 1–2 feet from driveways. Always test a small inconspicuous area first to dial in the right combination of distance and pressure.
Tip 6: Avoid Streaks and Lines
Prevent uneven patches by maintaining steady nozzle movement, overlapping each spray pass by about 30%, rinsing before detergent has a chance to dry, and cleaning one section at a time. Patience here prevents tiger-striping that's hard to fix after the fact.
Tip 7: Follow Safety Precautions
Always wear goggles and gloves. Use extension wands instead of climbing ladders. Turn off nearby electrical outlets before you start. Never direct spray toward people, pets, or glass. The CDC reports thousands of pressure washer injuries each year from improper technique or missing protection.