Wash your towels in hot water with a cup of vinegar, then run again in hot water with a half-cup of baking soda. That will strip your towels from all of that residue & mildew smell & will actually leave them feeling fluffy & smelling fresh.
Your bathtub will never be 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