Clean the table leaf before storing. Using a soft cloth, such as an old cotton T-shirt and a spray furniture polish or water, carefully wipe away any dust, crumbs and moisture.
Remove the leaf from the table. Get help if you need it; if you try to lift a wooden table leaf that is too heavy, you could drop it and damage the leaf or hurt yourself.
Insert the table leaf in the protective cover. If your cover has a plastic exterior, be sure that the inside of the cover is made from linen, cotton or felt to prevent the plastic from possibly damaging the table's finish.
Move the leaf to its storage location. Ideally, the table leaf should be stored as close to the table as possible so the temperature and humidity are the same for both pieces. This ensures the table and leaf expand and contract at the same rate so they will always fit together.
Store the table leaf horizontally, if possible. Avoid storing your leaf on its end or side for extended periods.