I don't have one, but have heard that smaller cups happen often. Must say I have NEVER cleaned it. Would explain the smaller and smaller cups I've been getting. Definitely doing this in the morning! How to clean your Keurig.
DIY Carpet Stain remover Fill a spray bottle with hydrogen peroxide and handful of baking soda. Shake it up and spray on carpet stains, upholstery stains, and clothing stains. pinner said, "I've used it for years and it works better than anything else.