Using a pressure washer on your urban outdoor furniture can be a double-edged sword. For durable materials like solid, untreated metal or concrete, a low-pressure setting with a wide fan tip and from a safe distance can blast away grime effectively. However, for most common furniture materials, a pressure washer poses a significant risk of damage. High-pressure water can splinter wood (especially softwoods and treated lumber), strip protective finishes and paint from metal leading to rust, fray and unravel synthetic wicker, and tear through cushion fabrics.
The best practice is to opt for gentler methods first. A mixture of mild soap and water with a soft brush or sponge is suitable for most materials. For stubborn mildew on cushions or furniture frames, a vinegar solution is effective. If you decide to use a pressure washer, always test on an inconspicuous area first. Use the lowest possible pressure setting (under 1200 PSI), maintain a distance of at least 12-18 inches, and keep the nozzle moving constantly. Never use a pinpoint jet stream. Ultimately, understanding your furniture's material is key to preserving its lifespan and appearance in your city balcony or patio oasis.