Pressure Washing Expert Tips & Best Practices

Whether cleaning your driveway or running a professional pressure washing business, the right technique makes all the difference. Learn from years of contractor experience what works and what doesn't.

Pressure Washing 101

Choose the Right PSI

2,500 PSI: Best for siding, wood decks, and delicate surfaces. 3,000-3,500 PSI: All-purpose for concrete and commercial surfaces. 4,000+ PSI: Heavy-duty concrete, oil stains, industrial cleaning.

Use the Right Nozzle

0 degree (red): Hardest impact; use only on concrete and stone. 15 degree (yellow): For concrete, heavy stains. 25 degree (green): Most versatile. 40 degree (white): Gentle for siding and painted surfaces. Soap nozzle (black): Low pressure for cleaner application.

Always Use the Right Cleaner

Driveway stains (grease/oil): Degreaser. Mold & mildew: Soft wash chemical. Rust stains: Rust remover. Algae: Sodium hypochlorite.

Surface-Specific Cleaning Guides

Concrete Driveways

Grease/oil: Pre-treat with degreaser, wait 15 min, pressure wash at 3000+ PSI. Rust: Apply rust remover, wait 20 min, pressure wash. Moss/algae: Soft wash, wait overnight, light rinse.

Wood Decks & Siding

Less is more. 1500-2500 PSI max, 40-degree nozzle. Use wood-specific cleaner. After cleaning: Let dry 48 hours, then apply sealant.

Roofs

Never use pressure on roofs. Use soft wash with algae killer. Let sit 24-48 hours, light rinse.

Pro Contractor Tips

Warm up engine 2-3 minutes. Check nozzle and hose for clogs. Use surface cleaners for flat areas (saves time). Pre-treat with cleaner. Batch jobs to cut travel time. Wear proper gear (slip-resistant shoes, waterproof). Start low pressure and increase if needed.

Safety First

Never point wand at people or animals. Wear eye protection. Check for power lines before using tall wands. Never use in rain. Keep bystanders 10 feet away. Turn off machine before changing nozzles.

Call (301) 519-9274 for pressure washing questions.