Why does dishwater or the dishwasher leave spots on glasses?
The spots that may appear on glassware after washing and air drying are caused by nontoxic minerals that remain on the glass when the water evaporates. Spots on glass shower doors appear for the same reason. Commercial products are available that allow the water to drain from glassware more completely.

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1. How hard is my water?
2. Is bottled water "better" than tap water?
3. I’ve heard about people installing filters or home treatment devices. Is that really necessary?
4. Who sets the water quality standards?
5. Why does my water sometimes have a chlorine taste and odor?
6. Why does drinking water often look cloudy when first taken from a faucet and then clear up?
7. Why is my drinking water ‘dirty’?
8. Why does dishwater or the dishwasher leave spots on glasses?