To prolong the life of your goggles, rinse them in freshwater without soap or cleaner after each use. Let your goggles air dry after cleaning. If your goggles have an anti-fog coating, use an anti-fog solution to clean them. Never use your hand, toothpaste or spit to clear them out. These will just do more damage than good.
Store your goggles in either the box or bag that they came in to avoid damage while they swim inside your bag or locker.