Keep in mind, water spots are either topical, that is a mineral sitting on top of the surface and for these types of spots Vinegar "might" work.
Other water spots are actually sub-surface or etchings or craters or possibly etched "rings" in the surface.
This could be in the surface of the coating, or in the paint.
If it's in the coating, be thankful because in the context and contrast of repainting a panel on your car, removing and re-applying a coating will be easier, faster and something you can do.
Most of us can't repaint our own car if the etchings or craters are too deep.
When sprinklers go off next to your car, you will be lucky if the problem is what is generally referred to as Hard Water Spots, which is actually Minerals dissolved in the water and then when the water evaporates the minerals remain on the surface.
Hope there isn't some type of chemical or substance in the water that makes it corrosive enough to etch, eat or dissolve your car's clear coat paint.
Meguiar's and Duragloss both make water spot removers.
The first sentence in the product description on the back of the Meguiar's label reads,
Specifically formulated to chemically break down and remove hard water MINERALs off the surface.
When I worked for Meguiar's the common question about this product is can it be used on automotive paints and the company answer at that time was all the field testing was done on Marine surfaces in Marine environments.
My experienced guess is that it won't in and of itself harm a clear coat surface.
Two comments...
The average person doesn't know the difference between a topical mineral deposit, (Type I Water Spot), or a sub-surface etching, (Type II Water Spot), and the average Joe Consumer buying this product to use on a modern clear coat to try to remove Type II Water Spots would be let down as they don't understand you would have to abrade the paint with a compound to remove Type II, thus they designate a product like this to the Marine market. Just my guess.
The first sentence in the product description on the back of the Duragloss label reads,
Formulated to easily remove water spots caused by impurities, (CALCIUM), in water.
Duragloss states it can be used for automotive finishes and it won't remove
durable polishes.
My guess is they are using the word "polishes"
generically to mean waxes, paint sealants or coatings, not
abrasive products used to remove swirls and scratches.
Try Vinegar first since its a common recommendation for water spots, if that doesn't work check the products above.
More here on water spots...
Water Spots
New - 3 - Types of Water Spots - Type I, Type II and Type III
How To Remove Sprinkler Water Spots
How to remove water spots by hand
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