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There are probably some filters you can use on the water you wash your car with to avoid the spots. The Mr. clean system comes to mind as an example. Washing with diluted vinegar solution may help.
I had water spots on my car after parking next to a sprinkler for a few days while I was on vacation. I think the minerals penetrated into my wax. When I removed the wax with diluted dawn the water spots were able to be removed with diluted vinegar.
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