Rinse Aid
A surfactant additive that helps water sheet off dishes during the rinse cycle, improving drying and reducing spots.
Definition
Rinse aid is a liquid surfactant additive dispensed during the dishwasher's rinse cycle that lowers the surface tension of water, causing it to sheet off dishes rather than bead. The result is dramatically better drying performance and fewer water spots and mineral deposits. Rinse aid is most important in hard water areas and with plastic items (which retain water more than glass or metal). Most dishwashers have an adjustable rinse aid dosage; increase the setting if you see water spots and decrease it if you see streaks of unrinsed surfactant.
Where this term appears
Rinse Aid comes up in product spec sheets, service reports, and troubleshooting documentation across most major appliance brands. If you encountered it in a manual or a service description and want context for how it fits into the larger picture, the related articles in the sidebar drill into the practical details. The glossary as a whole is intended as a quick lookup reference; for a deep dive on any specific topic, jump to the related buying guide or troubleshooting article.