Spring Pressure Washing: Revive Your Home's Exterior

Why spring is the ideal time to pressure wash

Winter leaves behind a cocktail of grime on every exterior surface: road salt residue on driveways, black algae streaks on north-facing siding, mildew colonies on decks that stayed damp under snow, and pollen that arrives in early spring and bonds to surfaces within days. Pressure washing in spring removes all of this before it stains permanently, and it gives you a clean baseline to spot problems — cracked caulk, peeling paint, rotting trim — while there's still time to fix them before summer heat sets in. It's also the best prep step if you're planning any exterior painting, staining, or sealing projects this year.

PSI guide by surface

Using the wrong pressure setting is the most common DIY mistake — too much pressure damages the surface, too little wastes time and water.

• Vinyl siding: 1,300–1,600 PSI with a 25° or 40° nozzle tip. Spray at a downward angle to avoid driving water behind the siding. Never aim upward at lap joints.
• Wood siding and fences: 1,200–1,500 PSI with a 25° tip. Keep the nozzle 12–18 inches from the surface to prevent wood fiber damage. Follow the grain direction.
• Concrete driveways and sidewalks: 2,500–3,000 PSI with a 15° or surface cleaner attachment. A surface cleaner ($40–$100 attachment) gives even results without striping.
• Wood decks: 1,000–1,500 PSI with a 25° or 40° tip. Lower pressure for softwoods (cedar, pine), higher for hardwoods (ipe, mahogany). Keep the nozzle moving — pausing even briefly gouges wood.
• Brick and stone: 1,500–2,000 PSI. Avoid pressure washing older brick (pre-1920s) with lime mortar — the mortar is softer than modern Portland cement and can be blasted out.
• Painted surfaces: 1,200–1,500 PSI maximum. Test a hidden area first. If paint is already loose, pressure washing will strip it — which may be the goal if you're prepping for repainting.

Pre-treatment for best results

Pressure alone won't kill mold or algae — it just blasts the surface layer off while leaving roots alive to regrow within weeks. Pre-treating with a cleaning solution is essential for lasting results.

• All-purpose: Mix 1 cup oxygen bleach (OxiClean, Stain Solver) per gallon of warm water. Apply with a pump sprayer, let dwell 10–15 minutes, then pressure wash. Safe for plants, decks, and painted surfaces.
• Heavy mildew/algae: Use sodium hypochlorite (pool shock) diluted to 1–3% with water plus a surfactant (dish soap). This is the "soft wash" method professionals use for roofs and siding. Kills organisms on contact. Rinse plants thoroughly before and after.
• Oil stains on concrete: Apply a degreaser (Simple Green, Zep) and scrub with a stiff brush before pressure washing. For deep oil stains, use a poultice of kitty litter or baking soda left overnight to draw oil out of the pores.
• Rust stains: Apply oxalic acid-based cleaner (available at hardware stores), let it dwell 5 minutes, then rinse at low pressure. Never use chlorine bleach on rust — it sets the stain.

Safety and preparation checklist

• Close all windows and doors before starting — pressure washers can drive water through weatherstripping
• Cover outdoor electrical outlets and light fixtures with plastic and tape
• Soak plants and shrubs within 6 feet of the work area before and after using any chemical solutions
• Wear safety glasses and closed-toe shoes — pressure washers propel debris at high velocity
• Never point the nozzle at people, pets, windows, or outdoor AC units
• Test your technique on an inconspicuous area first — the back corner of the garage, the bottom edge of siding
• Work from top to bottom on vertical surfaces so dirty runoff doesn't streak clean areas

DIY vs. professional pressure washing

Renting a pressure washer from a home improvement store costs $50–$100 per day plus $10–$30 for cleaning solutions. A typical whole-house wash takes a full day for a homeowner — longer if you've never done it. Professional pressure washing services charge $200–$500 for a whole house (1,500–2,500 sq ft of siding), $100–$300 for a driveway, and $150–$400 for a deck. The pro advantages are speed (they finish in 2–4 hours what takes you all day), proper chemical selection (they know which solutions work on which surfaces without causing damage), and equipment — commercial units deliver consistent pressure and hot water that rental units can't match. The ROI is clear when you factor in your time and the risk of damaging siding or wood with incorrect pressure.

When to call a professional

Hire a pro if you have two-story siding (working on a ladder with a pressure wand is extremely dangerous), if you see extensive mold or algae requiring soft-wash chemical treatment, if your deck needs stripping before re-staining (chemical strippers require precise dwell times and neutralization), or if you have delicate surfaces like stucco, Dryvit, or aged brick. A painter who offers pressure washing is ideal if you're planning to repaint afterward — they can assess the substrate condition during the wash and quote both jobs. A handyman handles standalone wash-and-go jobs efficiently.