I have to agree with DDX, it depends on what you're drinking. Milk bad, water, I sometimes go for a few days with the same water glass, as long as it was empty when I used it last. Bourbon, I go sometimes a week with the same glass, again as long as it was empty … Read more

Depends on what you're drinking. If it's milk.. Ewwww.... As in not milk eww. But dried up stale milk stain ewww.