As you can tell from all the helpful replies, that "crusty" material in your water bowls is the result of a buildup of the minerals dissolved in your water, chiefly calcium and magnesium. Any acid would get rid of them; you've found the cheapest and most easily purchased - vinegar. Distilled household vinegar costs between one and two dollars for a gallon, which will clean an awful lot of water bowls.

Here's another suggestion, and I hope you take this in the friendly way it's offered. If you cleaned your water bowls more frequently, then the calcium deposits wouldn't have a chance to build up. I'm just saying...

Also, some people use disposable deli cups and just replace them when necessary.

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