Dishwashers are affected by water quality and the type of detergent used during the washing and rinsing cycles. Many detergents that contain low or no phosphates may leave a white film or residue on dishware and the inside of the dishwasher. Over time this residue can become unsightly and could affect dishwasher performance. affresh Dishwashing Cleaner uses environmentally safer ingredients to help remove filming and spotting. It's safe to use with dishware. affresh Dishwashing Cleaner helps reduce mineral build up. Just one tablet, once a month is all it takes.