How you clean your patio furniture will depend on the piece and material. Plastics and metals can be wiped down with a warm, soapy cloth and rinsed with water from a hose or pressure washer. Cushions can be cleaned with a small amount of laundry detergent that is heavily diluted by warm water. Using gloves and a sponge or cloth, scrub the cushions and remove any dirt. Use water from the hose to rinse the cushions and remove any soap, then hang or lay in the sun to dry.