Outdoor furniture storage for the winter. Clean and dry outdoor furniture and equipment carefully before storing it for the season. This can be seen in the form of cushions, covers, hammocks, and umbrellas (some of these can be thrown in the washing machine; be sure to read labels and follow instructions). Use detergent and/or a moderate bleach solution to remove dirt and prevent mildew (again, depending on the material). Outdoor furniture should be stored in a cool, dry position off the ground, preferably in a garage or shed.