Distilled white vinegar efficiently removes water marks on glass. For especially stubborn stains, heat the vinegar to boiling for several minutes to concentrate the acid and increase its cleaning power. Wear gloves to protect your hands when handling the concentrated vinegar.Continue Reading
Heat 2 to 3 cups of white distilled vinegar to boiling over medium-high heat. Let boil for 5 to 7 minutes, or until slightly reduced. Boiling the vinegar allows some of the water to evaporate, concentrating the acetic acid.
Saturate a clean towel with the concentrated vinegar. Wear gloves to protect your hands from the heat of the vinegar and the more acidic vinegar solution.
Clean the glass with the vinegar-soaked towel. The spots should readily dissolve, but you may have to rub stubborn spots several times until the glass becomes clean. Alternatively, soak the glasses in a larger quantity of vinegar for a short period of time. Depending on how stained the glasses are, you can boil the vinegar, or use it straight from the container.
Rinse the glass well. Dry the glass, and inspect for residual spots. If spots remain, use vinegar to clean the glass again.