How to Pressure Wash a House: The Ultimate 2026 DIY Guide
Revive your home’s curb appeal and protect your siding with these expert-backed pressure washing techniques.
Why Pressure Washing Your House is Essential
Let’s be honest: a dirty house isn't just an eyesore; it’s a liability. Over time, your siding accumulates mildew, algae, pollen, and oxidation. If left untreated, these contaminants can lead to permanent staining or even rot. Learning how to pressure wash a house effectively can save you thousands in premature siding replacement while making your home the star of the neighborhood.
1. Gather Your Equipment and Supplies
Before you pull the trigger, you need the right tools. Using the wrong nozzle or too much power is the fastest way to etch wood or shatter vinyl siding.
- Pressure Washer: A unit with 2,000 to 2,800 PSI is usually sufficient for residential siding.
- Nozzle Tips: You’ll need a 25-degree (green), 40-degree (white), and a soap nozzle (black).
- House Wash Detergent: Look for "biodegradable" and "siding-safe" formulas.
- Extensions/Wands: For reaching second stories without a ladder (ladders + pressure washers = danger).
- Personal Protective Equipment (PPE): Safety goggles, non-slip boots, and gloves.
2. Understanding Nozzles and PSI
In 2026, "Soft Washing" is the industry standard for home exteriors. High pressure is for concrete; volume and chemistry are for houses. Use the table below to choose your nozzle wisely:
| Nozzle Color | Degree | Best Use Case |
|---|---|---|
| Black | 65° | Applying soap/detergent (Low pressure). |
| White | 40° | Rinsing siding and windows safely. |
| Green | 25° | Heavy stains on brick or concrete (Use with caution). |
| Red | 0° | DO NOT USE on house siding. It acts like a laser. |
3. Preparation: Protect Your Property
Pro Tip: Electricity and water are a bad mix. Always tape over exterior outlets and doorbells before starting.
- Close Windows and Doors: Double-check the seals.
- Pre-Wet Plants: Soak your garden and shrubs with a garden hose. This prevents them from absorbing the detergent.
- Clear the Area: Move patio furniture, toys, and cars away from the "splash zone."
4. The Step-by-Step Washing Process
Step A: Apply the Detergent (Bottom to Top)
Switch to your black soap nozzle. Start applying the cleaning solution from the bottom of the wall and work your way up. This prevents "streak marks" caused by dirty water running down dry, un-soaped siding.
Step B: Let it Dwell
Allow the soap to sit for 5 to 10 minutes. Do not let the soap dry on the siding. If it starts to dry, mist it lightly with water.
Step C: The Rinse (Top to Bottom)
Switch to the 40-degree (white) nozzle. Now, work from the top down. This ensures all dirt and soap residue are flushed off the house completely. Keep the wand at a 45-degree angle to the siding and maintain a distance of at least 12 to 18 inches.
5. Common Mistakes to Avoid
- Spraying Upward: Never spray water up under the laps of vinyl siding. This can trap moisture behind the walls, leading to mold inside your home.
- Using a Ladder: The kickback from a pressure washer can easily knock you off a ladder. Use an extension wand instead.
- Ignoring the Wind: Always wash with the wind at your back to avoid a face full of detergent.