Use a soft bristle brush to clear the chairs of any large pieces of dust, dirt or debris.
Use a screwdriver to tighten the screws holding the seat cushions and backrest of the chairs to the chair frames if necessary.
Clean the chrome of rust, if necessary. There are several different methods you can try for this, depending on how much rust is on the chrome. For lightly rusted or tarnished chrome, rub the chrome with gentle pressure using a soft cloth dampened with vinegar.
Use aluminum foil and vinegar to clean heavily rusted chrome chairs. Fold a piece of aluminum foil into a square, with the shiny side showing. Scrunch the foil a little until it is no longer completely smooth and then dip it in a small container of vinegar. Rub the vinegar-soaked foil against the chrome vigorously, stopping occasionally to wipe away the gray liquid that forms, using a clean soft cloth. Repeat until the rust has been completely removed.
Purchase naval jelly from a home improvement store or boating supply store and apply as directed to remove rust if the aluminum foil and vinegar combination isn't successful.
Dampen a clean soft cloth with warm water and mild dish soap to clean vinyl seat cushions and backrests, if necessary. Lightly rub the vinyl to remove dirt and wipe dry immediately with a clean, soft cloth to avoid leaving water stains.
Examine the vinyl for any tears. You can repair small holes in the vinyl by using a vinyl repair kit. Follow the manufacturer's direction to achieve the best results. If there are large holes in the vinyl or deep cracking from age and wear, you should consider having the seats and backrests reupholstered professionally.