Dish detergent, hard water, and dark liquids can often leave behind a hard-to-clean residue on your drinking glasses. One of the strongest, most effective cleaners for drinking glasses is vinegar. When used properly, the natural acid in the vinegar will dissolve all of the build-up on the drinking glasses, plus kill germs and dry streak-free.
Microwave several bowls of vinegar for about 1 minute each or until the vinegar is lukewarm. Pour the vinegar into a large basin. Use enough warm vinegar to submerge all of the drinking glasses.
Place the glasses into the basin, and let soak for one hour.
Remove the glasses from the vinegar, and rinse each glass with warm water.
Wipe the glasses with a washcloth if necessary to remove any remaining build-up.
Dry the drinking glasses with a dish towel.