Pressure washing can be an effective way to clean outdoor furniture, but whether it's safe depends entirely on the material and your technique. Used incorrectly, a pressure washer can cause significant and permanent damage.
For durable materials like wrought iron, aluminum, and solid teak wood, pressure washing is generally acceptable. Use a wide-angle (40-degree) nozzle, maintain a safe distance of at least 12-18 inches, and keep the pressure on a low setting. This will blast away dirt and grime without harming the finish.
However, for many common furniture materials, pressure washing is a bad idea. Avoid using it on:
- Wicker and Rattan: The high-pressure water can split and unravel the natural fibers or crack synthetic resin.
- Soft Woods like Pine: The force can splinter the wood and destroy its protective sealant.
- Furniture with Cushions: Water can be forced deep into the fabric and foam, leading to mold and mildew.
- Weathered or Old Furniture: The already compromised structure may not withstand the force.
A safer alternative for delicate furniture is to use a garden hose with a spray attachment, a soft brush, and a mild soap solution. This method provides more control and prevents water from being driven into joints and crevices.
Always check the manufacturer's cleaning recommendations first. When in doubt, err on the side of caution and use the gentlest cleaning method possible to extend the life of your outdoor investment.