Distilled water rinse after washing.

Rinsing glassware with distilled water as a final step after washing is a preventative measure against hard water stains. Distilled water is purified and free of minerals, so it will not leave behind mineral deposits as it dries. This simple step can significantly reduce the formation of new hard water stains and maintain the clarity of glassware over time. It is especially effective in areas known for hard water.