The maintenance and cleaning of garden chairs depend on their material. For wooden chairs, apply a protective sealant annually to prevent weathering and decay. Metal chairs may need occasional rust prevention treatments. Plastic and resin chairs can be easily cleaned with soapy water and a soft brush. Wicker furniture should be dusted and cleaned with a damp cloth. Fabric cushions should be stored indoors when not in use and cleaned according to the manufacturer's instructions. Always follow the care guidelines for your specific garden chair's material.