Think about the surface first
Concrete driveways and patios generally tolerate more cleaning power than painted surfaces, wood, vinyl siding, or vehicles. The wrong pressure, nozzle, or distance can permanently damage a surface.
Before renting, identify what you are cleaning, whether water is available at the job site, and whether you need to work around landscaping, windows, outlets, or drains.
Use a controlled test area
Start with the widest appropriate spray pattern and test in a small, inconspicuous spot. Keep the wand moving and maintain a safe distance from the surface rather than concentrating pressure in one place.
Read the equipment instructions before use and wear appropriate eye protection and closed-toe footwear. Never point the spray wand at people, animals, electrical equipment, or fragile surfaces.
Plan for runoff and cleanup
Move loose objects, cover sensitive areas as needed, and keep cleaning runoff away from areas where it could cause a problem. Let cleaned surfaces dry before evaluating whether another pass is needed.
A little preparation makes a pressure-washing project faster and helps avoid damage that costs more than the rental.