Spots on dishes are often caused by hard water minerals, low rinse aid, poor water temperature, clogged spray arms, dirty filters, or detergent that is not dissolving properly. Glassware and silverware usually show spotting first because mineral residue is easier to see on reflective surfaces.
If the dishwasher is not rinsing properly, water pressure, spray arm movement, filter condition, and wash temperature should be checked. In some cases, cleaning and maintenance may help, while other situations may require repair of a failed component.
Columbine Appliance & Fireplaces provides dishwasher diagnostics and repair in Fort Collins, CO, serving homeowners throughout Larimer County.