If you have an unsightly white ring (or two) around your faucet, don't be embarrassed. Practically every metal faucet gets these calcium buildups, and they just take a little elbow grease to get out. Don't jump towards harsh and expensive chemical treatments; all you need to chase the rings away is every green-cleaner's best friend: lemon juice.
After juicing a lemon for a recipe or beverage, don't just toss the remnants into the trash. Holding a lemon half (or wedge) by the peel side, rub the flesh over a faucet blemished with calcium (water) stains to remove them. Your sink will be sparkling like new -- and smelling unbelievably fresh.