Yes—but only if you match the method to the material. Pressure washing can be a fast way to lift urban grime, pollen, bird droppings, and pollution film from outdoor furniture, but it can also strip powder coating, blast water into seams, fuzz wood, dent soft aluminum, or wreck wicker and fabric if you use the wrong tip or too much pressure. I would treat it as a low-risk cleaning option for sturdy, well-sealed pieces and a no-go or very careful job for delicate ones.
For powder-coated aluminum or steel, start with the lowest pressure setting, a wide fan tip (40–60 degrees), and keep the nozzle at least 8–12 inches away. Test a hidden spot first. Move with the surface, not against it, and don’t dwell on edges, welds, chips, or joints where water can get underneath. A gentle outdoor furniture cleaner and a soft brush often do most of the work; the pressure washer should just rinse. Avoid turbo tips and narrow pinpoint streams.
Solid wood, teak, and painted wood need extra caution. Too much pressure raises the grain, opens cracks, and removes finish. Use low pressure, keep the nozzle moving, and dry the surface afterward. Wicker, rattan, woven resin, and rope furniture are usually better cleaned with a soft brush, mild soap, and a hose—pressure can loosen weaves and force water inside. Cushions and outdoor fabrics should follow the label; most should be removed and cleaned separately, not pressure-washed in place. Wrought iron with aged paint or rust spots also needs a gentle hand, followed by touch-up to prevent rust.
Before you start, sweep off loose dirt, cover nearby plants or delicate surfaces, and check the manufacturer’s care guide. Work on a mild day so everything dries fully, and avoid spraying upward into seams or electrical components. If the finish is already chipped, cracked, or chalky, skip the pressure washer and use a manual clean-and-touch-up approach.
So yes, urban outdoor furniture can be pressure-washed without ruining the finish—but only with low pressure, a wide nozzle, a test patch, and realistic judgment about the material. When in doubt, less pressure and more patience is the safer way to keep outdoor furniture looking good.