I’d treat urban outdoor furniture like a finished surface, not a driveway. Start by removing loose dust, soot, pollen, and grit with a soft brush or a vacuum brush attachment. Don’t scrub dry dirt because it acts like sandpaper and can dull the finish. For bird droppings, lay a wet microfiber cloth over the spot for a few minutes to soften it, then lift it away gently—never scrape it with a knife or abrasive pad.
Use the mildest cleaner that works: a few drops of pH-neutral dish soap in warm water is usually enough. Stay away from bleach, ammonia, citrus cleaners, abrasive powders, and magic erasers, since they can dull powder coating, strip wax, or etch stone. Always test any cleaner on a hidden spot first.
For powder-coated metal, wipe with a soft microfiber cloth or sponge, rinse thoroughly, and dry with a clean microfiber towel to avoid water spots. Don’t use a pressure washer; it can force water into joints and chip the finish. For wood, use a wood-safe soap and avoid soaking; rinse quickly and dry. If the wood looks dry, re-oil it according to the manufacturer’s instructions. For wicker or rattan, use a soft brush and minimal water, then let it dry completely in a shaded, airy spot. Stone and concrete can usually handle mild soap, but avoid acidic cleaners.
Rinse well—soap residue attracts dirt and makes the finish look dull. Work in the shade, not direct sun, so the cleaner doesn’t dry too fast. After cleaning, protect the furniture with covers when possible, touch up small chips, and use a manufacturer-approved protectant or wax if the finish calls for it. A weekly dust-down and a gentle monthly wash will keep urban furniture looking good without harming the finish. If you’re unsure about a material, check the manufacturer’s care label or test a tiny area first.