Your view of coffee mug stains -- like that other famous glassware optimism metric -- is also a litmus test for your view on life. Sure, maybe your favorite daily coffee or tea cup is tarnished.

Stains can become a significant issue for many, particularly if you're fond of a steaming cuppa. Tea and coffee drinkers know ...

If you're a tea lover, you're likely familiar with the frustration of pulling your mugs out of the dishwasher only to find them still marked with stubborn stains on the inside. Tea is notorious ...