Vinegar is excellent as the previous posts stated. If you are still finding after the cycle completes you still have spots, you can use Bar keeper's friend. It's similiar to comet and ajax but it is far better. It polishes brass, use on porcelin, glass,plastic, stainless steel, copper etc. The possibilities are endless. you can find this product in most Grocery stores. It is in a gold can with blue writing. look for it where you would find comet.
Here's the website for further info on product:
To remove water stains from the dishwasher use vinegar.
I put the vinegar in a large bowl that the dishes or glasses will fit in. Put in about 3" of vinegar and roll the glasses in the vinegar for a few seconds, they will sparkle.Then just rinse in cold water. I save the vinegar in a jar in case I need it again.
I pour vinegar in the dishwasher.I also put vinegar in my liquid dish soap, when i hand wash my dishes
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