Lawn furniture seems to be a magnet for all the grit and muck that nature can come up with. Outdoor chairs, tables, and loungers can be found caked with dirt, cobwebs, and grease, especially if they've been in storage for a while. Clean them off with a baking soda solution, using 1 cup baking soda added to some warm water. Wipe it on the furniture, then rinse thoroughly.
White wicker furniture is lovely to have for your yard and patio, but it can take a beating if out in the sun too much or left in the rain. You can help keep it from yellowing by scrubbing it periodically with a stiff brush that you have first moistened with salt water. Scrub every nook and cranny in the chairs and loungers and rinse thoroughly. Then let the pieces sit in the sun to dry, changing their position (upside-down, sideways, etc.) every so often.