White deposit on flatware and glasses

For some unknown reason, my dishwasher, which has always worked well, has left a hard, white deposit on my flatware, glasses, and stainless pots. I haven't switched detergents or made any changes in the water supply. I use the type of detergent that is not supposed to harm or cloud up glasses, etc.
The deposit is difficult to remove without scratching the surface of the utensils and glasses. Any suggestions?

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