To keep outdoor furniture looking new and prevent it from being damaged, it is important to weatherproof the items. Most wooden furniture pieces will need to be weatherproofed every two years, as the weatherproofing lacquer wears off after some time. Following are some simple steps and affordable tips that will help outdoor furniture last for years.1. Wash FurnitureBe certain to wash the furniture thoroughly before weatherproofing. All of the dirt and grime must be scrubbed off and the furniture rinsed with a hose. Some stains and dirt may be hard to remove, especially if there is tree sap. Simple Green works well for removing tough grime and stains. For most surfaces, cleaning with a solution of TSP powder and laundry detergent diluted with water is sufficient. Use a gentle scrub brush on