Pressure washing is a cleaning method that uses a high-pressure stream of unheated water to remove dirt, grime, mold, mildew, and loose paint from durable surfaces.
Key Characteristics:
Mechanism: A motor (gas or electric) powers a pump that forces water through a specialized nozzle at high speed.
Pressure Range: Equipment typically operates between 1,300 and 4,000 PSI (pounds per square inch).
Temperature: Unlike “power washing,” standard pressure washing uses cold or room-temperature water.
Suitability: It is ideal for hard, non-porous surfaces like concrete driveways, brick walls, and stone pathways.
Pressure Washing vs. Related Methods
| Method | Water Temperature | Pressure Level | Best Use Case |
|---|---|---|---|
| Pressure Washing | Cold / Ambient | High (1,300+ PSI) | General cleaning of hard surfaces (decks, driveways) |
| Power Washing | Hot (up to 200°F) | High (1,300+ PSI) | Heavy-duty grease, oil, and sanitized cleaning |
| Soft Washing | Cold / Ambient | Low (150–500 PSI) | Delicate surfaces like roofs, siding, and painted wood |
Important Considerations:
Cleaning Power: The effectiveness is calculated by multiplying PSI by GPM (gallons per minute) to determine “Cleaning Power” (CP).
Potential for Damage: If used incorrectly, high pressure can etch concrete, strip paint, or splinter wood.
Safety: The high-velocity stream is powerful enough to cause severe skin lacerations and eye injuries; protective gear is recommended.
