Using a power washer to clean outdoor furniture can be effective, but it requires caution to avoid damage. The suitability depends heavily on the material of your furniture.
For durable materials like aluminum, wrought iron, or some hard plastics, a power washer can be used effectively. It's crucial to use a wide-angle nozzle (40-degree) and maintain a safe distance of at least 12-18 inches to prevent stripping paint or denting the metal. Always test on an inconspicuous area first.
However, for softer materials like wood (especially softer woods like pine), wicker, or resin, a power washer is often too aggressive. The high-pressure stream can splinter wood, fray wicker fibers, and etch or crack plastic resin, leading to permanent damage. For these delicate materials, gentler methods are recommended. Mix a solution of mild dish soap and warm water, and use a soft-bristled brush to scrub the surfaces. A garden hose is perfect for rinsing.
In conclusion, while a power washer is a powerful tool for cleaning sturdy outdoor furniture, it poses a significant risk to more delicate pieces. When in doubt, opt for the safer, manual cleaning approach to preserve the beauty and longevity of your outdoor investment.