Make crystal sparkle: Has the twinkle gone out of your good crystal? Bring back its lost luster by mixing several drops of ammonia in 2 cups water and applying with a soft cloth or brush. Rinse it off with clean water, then dry with a soft, dry cloth.
Glass Shower Door Cleaner. Lemon Pledge. Spray on door and leave for 20 - 30 minutes. Scrub with A stiff scrubby or magic eraser. Rinse well. The lemon will break up the gunk and the oils will repel water and gunk for a few weeks. Do this once a month or more as needed. Caution you will need to wash the floor of the shower well after this or it will be slippery.