Add 1/4 cup liquid dish soap to a bucket of hot water, and scrub your wrought iron furniture with a scrub brush to remove dirt and debris.
Rinse by spraying with a hose, removing all soapy residue.
Dry your wrought iron patio furniture with a cotton towel or a hair dryer, then let dry completely in a well-ventilated area, preferably in the sunshine.
Sand where necessary to remove rust or chipping paint. Sand all the way through the rust to remove it completely.
Paint the area with a green rust remover that turns into a black powder if rust is present. Brush off the black residue to remove final traces of rust.
Take your wrought iron piece to a professional welder for repair before proceeding if there are broken or weak sections.
Apply a rust resistant primer to all surfaces, and let dry thoroughly.
Apply two thin, even coats of rust resistant paint, according to the manufacturer's instructions on the can, to cover repairs and brighten your furniture.
Let your wrought iron patio furniture dry, undisturbed, in a sheltered area for 24 hours before use.