I use cascade liquid with extra cleaning action and cascade rinse aid.....................we have well water I understand the problem. And if that does not help you then need 2 filters from Lowes, one white with string and 1 black for minerals. This was the only thing that resolves stains in the tubs, sinks& toilet. Clothes are cleaner, no more stains from minerals. We use the combination..........right off the cold water line.....the white string one first as that filters better than the other one, then the black one 2nd.............we also use a brita water filter for the cold water to make ice tea & drinking cold water.