Keep your wicker resin chairs free of debris. Dust, dirt, leaves and especially soggy leaves can slowly cause virtually any surface to deteriorate over time. Vacuum the chairs regularly with a hand-held vacuum cleaner or an attachment from an upright vacuum, being careful to remove dirt from corners and crevices.
Wipe the chairs with a damp cloth and wipe them dry regularly. Although you can literally hose down your resin chairs, it is better not to saturate the resin. If the chairs are dirty or stained, clean them with a mixture of water and mild dish soap and then wipe them dry.
Keep your resin chairs out of the path of doors, bicycles, grills, cars and other heavy objects. Resin is a form of plastic and so can succumb to dents. Store your resin chairs in a safe place during storms or high winds; heavy wind gusts can pick up, toss and dent lightweight resin chairs.
Keep your resin chairs away from grills and outdoor heaters, as plastic can melt. Although resin is largely weather resistant, it is best to store resin chairs in a garage or shed rather than leave them exposed to the elements -- especially snow, hail and downpours -- for prolonged periods of time.
Add upholstered seat cushions to provide an extra layer of protection to your chairs. Unlike traditional wicker, resin wicker shouldn't "budge" or make a cracking noise when someone settles his weight into a chair; the resin fibers reinforce the wicker with greater strength and flexibility. Still, padding can increase comfort. The cushions could block accidental punctures and dents and might even elevate the style quotient that led you to purchase the chairs in the first place.