When washing by hand, avoid using scouring pads and/or abrasive detergents. To prevent spotting, combine a quarter cup ammonia with a mild lemon detergent. Clean bowls, vases and decanters by filling them half-full with moderately hot water, a small amount of mild detergent, two tablespoons of white vinegar or ammonia and 1/2 cup uncooked rice. Swirl the rice around for a few minutes to remove residue. Do not use an automatic dishwasher as this could cause your crystal to lose its brilliance. Rinse well with warm water and air dry.