My bathtub has never been whiter!! Works great on glass shower doors too- no more soap residue! Martha Stewart's Tub Scrub--works better than any other cleaning product to get off hard water and soap residue
To get your drain running again (without resorting to chemicals worthy of a hazmat suit) pour ½ cup soda, then ½ cup vinegar, down a clogged drain. Cover it with a wet cloth, wait 5 minutes, uncover, and flush with steaming-hot water.