Vacuum the chair cushion regularly to remove debris. The cushion is attached to the chair with hook-and-loop fasteners for ease in removal. If necessary, remove the cushion to vacuum underneath.
Clean the wire frame with a nonabrasive metal cleaner. Furniture website Knoll.com recommends Windex, Fantastik, or a similar spray-on cleaner that won't harm the metal.
Protect your Platner wire chair from the elements by sheltering it from rain and bringing it indoors for the winter. The cushion could mildew or the frame could corrode with repeated exposure to the elements.
Use steel wool to remove discoloration from a nickel-finished Platner chair. Rub the steel wool down the spines to restore the metal's luster.