How to Power Wash House Siding
Clean your home's exterior siding to remove dirt, mildew, and grime
What You'll Need
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Tools
Pressure washer
1500-2000 PSI for most siding
Extension wand
For reaching high areas
25 or 40 degree nozzle
Wide spray pattern
Garden hose
Safety glasses
Materials
Step-by-Step Instructions
Prepare the area
15-30 minutes
Close all windows and doors tightly. Cover electrical outlets, light fixtures, and doorbells with plastic. Move or cover plants and outdoor furniture. Disconnect garden hose from outdoor faucets being sprayed near.
Pro Tip
Wet plants before and after washing to minimize detergent damage.
Set up the pressure washer
10 minutes
Connect the garden hose and turn on water. Check oil level on gas units. Start with a 25 or 40 degree nozzle (white or green tip). Never use the 0 degree tip on siding.
Warning
The 0 degree (red) nozzle can damage siding, break windows, and cause injury.
Test in an inconspicuous area
5-10 minutes
Start on a hidden section to test pressure and distance. Hold the wand at least 12 inches from the surface. Move closer gradually. You want to clean the siding without damaging it.
Pro Tip
Different siding materials require different pressures: vinyl can handle 1500-2000 PSI, wood is more delicate.
Apply detergent (optional but recommended)
20-30 minutes
Switch to the detergent nozzle (black tip) or low-pressure setting. Apply detergent from bottom to top to prevent streaking. Let it sit for 5-10 minutes but don't let it dry.
Pro Tip
Working in sections prevents detergent from drying on the surface.
Track your progress and get AI feedback on your work
Track This Project FreeRinse from top to bottom
1-2 hours
Switch back to the cleaning nozzle. Rinse from top to bottom, working in sections. Keep the spray at a slight downward angle to avoid forcing water behind siding. Overlap your strokes.
Warning
Never spray upward under lap siding - water can get behind the siding and cause damage.
Address stubborn spots
20-30 minutes
For areas with heavy mildew or stains, apply a mildew cleaner with a brush. Let it work for a few minutes, then rinse. Repeat if necessary.
Clean up
15 minutes
Rinse any remaining detergent from plants and walkways. Remove protective coverings. Run clean water through the pressure washer to clear detergent from the system.
Common Mistakes to Avoid
- Using too much pressure (damages siding)
- Spraying upward under lap siding (causes water damage)
- Holding the nozzle too close
- Letting detergent dry on the surface
- Not testing pressure first
- Spraying windows directly (can break seals)
Safety Warnings
- Never point the pressure washer at people, animals, or windows
- Wear safety glasses - debris can fly back at you
- Be careful on wet surfaces - they're slippery
- Don't use a ladder while operating a pressure washer
When to Call a Professional
For multi-story homes requiring scaffolding, if siding is damaged or loose, or for delicate materials like stucco that require special techniques.
Have a bigger project in mind? Tell us what you need and help us decide what to build next.
Frequently Asked Questions
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Project Overview
- Difficulty
- Intermediate
- Time
- 2-4 hours
- Est. Cost
- $50–$150
- Tools
- 5 items
- Materials
- 2 items
- Steps
- 7
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